Javier DeFelipe
- Published in print:
- 2009
- Published Online:
- January 2010
- ISBN:
- 9780195392708
- eISBN:
- 9780199863525
- Item type:
- book
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780195392708.001.0001
- Subject:
- Neuroscience, History of Neuroscience, Molecular and Cellular Systems
This book contains a large collection of beautiful figures produced throughout the 19th and beginning of the 20th century, which represent some characteristic examples of the early days of research ...
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This book contains a large collection of beautiful figures produced throughout the 19th and beginning of the 20th century, which represent some characteristic examples of the early days of research in neuroscience. The main aim of this work is to demonstrate to the general public that the study of the nervous system is not only important for the many obvious reasons related to brain function in both health and disease, but also for the unexpected natural beauty that it beholds. This beauty has been discovered thanks to the techniques used to visualize the microscopic structure of the brain, a true forest of colorful and florid neural cells. As illustrated by his marvelous drawings, the studies of Santiago Ramón y Cajal (1852-1934) no doubt contributed more than those of any other researcher at the time to the growth of modern neuroscience. Thus, his name has been honored in the title of this book, even though the figures contained in the main body of it are from 91 different authors. Looking at the illustrations in this book, the readers will find that many of the early researchers that studied the nervous system were also true artists, of considerable talent and esthetic sensibility. Hence, the present book contains numerous drawings of some of the most important pioneers in neuroscience, including Deiters, Kolliker, Meynert, Ranvier, Golgi, Retzius, Nissl, Dogiel, Alzheimer, del Rio-Hortega, and de Castro.Less
This book contains a large collection of beautiful figures produced throughout the 19th and beginning of the 20th century, which represent some characteristic examples of the early days of research in neuroscience. The main aim of this work is to demonstrate to the general public that the study of the nervous system is not only important for the many obvious reasons related to brain function in both health and disease, but also for the unexpected natural beauty that it beholds. This beauty has been discovered thanks to the techniques used to visualize the microscopic structure of the brain, a true forest of colorful and florid neural cells. As illustrated by his marvelous drawings, the studies of Santiago Ramón y Cajal (1852-1934) no doubt contributed more than those of any other researcher at the time to the growth of modern neuroscience. Thus, his name has been honored in the title of this book, even though the figures contained in the main body of it are from 91 different authors. Looking at the illustrations in this book, the readers will find that many of the early researchers that studied the nervous system were also true artists, of considerable talent and esthetic sensibility. Hence, the present book contains numerous drawings of some of the most important pioneers in neuroscience, including Deiters, Kolliker, Meynert, Ranvier, Golgi, Retzius, Nissl, Dogiel, Alzheimer, del Rio-Hortega, and de Castro.
Javier Defelipe
- Published in print:
- 2009
- Published Online:
- January 2010
- ISBN:
- 9780195392708
- eISBN:
- 9780199863525
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780195392708.003.0001
- Subject:
- Neuroscience, History of Neuroscience, Molecular and Cellular Systems
This introductory chapter begins with a brief discussion of the many contributions of Santiago Ramón y Cajal, who is considered the father of modern neuroscience. He published almost 300 articles and ...
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This introductory chapter begins with a brief discussion of the many contributions of Santiago Ramón y Cajal, who is considered the father of modern neuroscience. He published almost 300 articles and several books of great importance, such as the classics Textura del Sistema Nervioso del Hombre y de los Vertebrados (1899-1904) and Estudios Sobre la Degeneración y Regeneración del Sistema Nervioso (1913-1914). He also received numerous awards and distinctions, including some of the most prestigious awards of his time: the Moscow Award (1900); the Helmholtz Gold Medal (1905); and the Nobel Prize for Physiology or Medicine (1906). The chapter then goes on to discuss why scientists often referred to trees and forests in their descriptions of the brain and, in particular, of the cerebral cortex, and how these neuronal forests served as an unlimited source of artistic and poetic inspiration to many scientists.Less
This introductory chapter begins with a brief discussion of the many contributions of Santiago Ramón y Cajal, who is considered the father of modern neuroscience. He published almost 300 articles and several books of great importance, such as the classics Textura del Sistema Nervioso del Hombre y de los Vertebrados (1899-1904) and Estudios Sobre la Degeneración y Regeneración del Sistema Nervioso (1913-1914). He also received numerous awards and distinctions, including some of the most prestigious awards of his time: the Moscow Award (1900); the Helmholtz Gold Medal (1905); and the Nobel Prize for Physiology or Medicine (1906). The chapter then goes on to discuss why scientists often referred to trees and forests in their descriptions of the brain and, in particular, of the cerebral cortex, and how these neuronal forests served as an unlimited source of artistic and poetic inspiration to many scientists.
Charles E. Ribak, Carlos Aramburo de la Hoz, Edward G. Jones, Jorge A. Larriva Sahd, and Larry W. Swanson (eds)
- Published in print:
- 2008
- Published Online:
- May 2009
- ISBN:
- 9780195369007
- eISBN:
- 9780199865253
- Item type:
- book
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780195369007.001.0001
- Subject:
- Neuroscience, Molecular and Cellular Systems, Development
This book describes current information about the three areas mentioned in the title: neuronal migration and development, degenerative brain diseases, and neural plasticity and regeneration. The ...
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This book describes current information about the three areas mentioned in the title: neuronal migration and development, degenerative brain diseases, and neural plasticity and regeneration. The chapters in the first section of the book examine the cellular and molecular mechanisms by which neurons are generated from the ventricular zone in the forebrain and migrate to their destinations in the cerebral cortex. This description of cortical development also includes discussions of the Cajal-Retzius cell. Another chapter provides insight about the development of another forebrain region, the hypothalamus. The remaining chapters of the first section examine the clinical relevance of brain development in certain disease states in humans. The second section begins with details about the dopaminergic neurons in the substantia niger and their loss in Parkinson's disease. Two subsequent chapters describe changes in brain aging, including changes in the numbers of myelinated axons. Other chapters in this section describe important cellular and molecular changes found in Alzheimer's disease and human epilepsy. The last section begins with a chapter on how the brain's own stem cells provide newly generated neurons to the hippocampal dentate gyrus and how these neurons become integrated into neural circuitry. Then two chapters examine some of the neuroplastic changes that take place in motor and sensory cortices of awake behaving primates. The concluding two chapters address the issue of regeneration in the injured spinal cord and the factors that may contribute to its success.Less
This book describes current information about the three areas mentioned in the title: neuronal migration and development, degenerative brain diseases, and neural plasticity and regeneration. The chapters in the first section of the book examine the cellular and molecular mechanisms by which neurons are generated from the ventricular zone in the forebrain and migrate to their destinations in the cerebral cortex. This description of cortical development also includes discussions of the Cajal-Retzius cell. Another chapter provides insight about the development of another forebrain region, the hypothalamus. The remaining chapters of the first section examine the clinical relevance of brain development in certain disease states in humans. The second section begins with details about the dopaminergic neurons in the substantia niger and their loss in Parkinson's disease. Two subsequent chapters describe changes in brain aging, including changes in the numbers of myelinated axons. Other chapters in this section describe important cellular and molecular changes found in Alzheimer's disease and human epilepsy. The last section begins with a chapter on how the brain's own stem cells provide newly generated neurons to the hippocampal dentate gyrus and how these neurons become integrated into neural circuitry. Then two chapters examine some of the neuroplastic changes that take place in motor and sensory cortices of awake behaving primates. The concluding two chapters address the issue of regeneration in the injured spinal cord and the factors that may contribute to its success.
Ivan Soltesz
- Published in print:
- 2006
- Published Online:
- May 2009
- ISBN:
- 9780195177015
- eISBN:
- 9780199864713
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780195177015.003.0001
- Subject:
- Neuroscience, Neuroendocrine and Autonomic, Techniques
This introductory chapter begins with a discussion of early studies in neuroanatomy. It then considers the contributions of improved single cell visualization methods and presents a listing of some ...
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This introductory chapter begins with a discussion of early studies in neuroanatomy. It then considers the contributions of improved single cell visualization methods and presents a listing of some of the major discoveries concerning interneuronal microcircuits within the hippocampus and neocortex. The idealized form of an interneuronal type is discussed. Finally, the chapter briefly addresses how earlier neuroscientific thinkers, and particularly Cajal, dealt with the conjoint problems of the idealization of cell types and the existence of cell-to-cell variability.Less
This introductory chapter begins with a discussion of early studies in neuroanatomy. It then considers the contributions of improved single cell visualization methods and presents a listing of some of the major discoveries concerning interneuronal microcircuits within the hippocampus and neocortex. The idealized form of an interneuronal type is discussed. Finally, the chapter briefly addresses how earlier neuroscientific thinkers, and particularly Cajal, dealt with the conjoint problems of the idealization of cell types and the existence of cell-to-cell variability.
José Luis Díaz
- Published in print:
- 2008
- Published Online:
- May 2009
- ISBN:
- 9780195369007
- eISBN:
- 9780199865253
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780195369007.003.0001
- Subject:
- Neuroscience, Molecular and Cellular Systems, Development
Many Mexican neuroscientists consider themselves to some extent to be descendants or at least beneficiaries of the School of Santiago Ramón y Cajal. This chapter outlines the genealogy linking them ...
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Many Mexican neuroscientists consider themselves to some extent to be descendants or at least beneficiaries of the School of Santiago Ramón y Cajal. This chapter outlines the genealogy linking them to this great Spanish master not only scientifically, but culturally, linguistically, and philosophically—beyond a strictly academic affiliation to one that is social and political in nature.Less
Many Mexican neuroscientists consider themselves to some extent to be descendants or at least beneficiaries of the School of Santiago Ramón y Cajal. This chapter outlines the genealogy linking them to this great Spanish master not only scientifically, but culturally, linguistically, and philosophically—beyond a strictly academic affiliation to one that is social and political in nature.
Juan A. De Carlos and Fernando García-Moreno
- Published in print:
- 2008
- Published Online:
- May 2009
- ISBN:
- 9780195369007
- eISBN:
- 9780199865253
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780195369007.003.0002
- Subject:
- Neuroscience, Molecular and Cellular Systems, Development
This chapter discusses the cellular and molecular mechanisms by which neurons are generated from the ventricular zone in the forebrain and migrate to their destinations in the cerebral cortex. Topics ...
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This chapter discusses the cellular and molecular mechanisms by which neurons are generated from the ventricular zone in the forebrain and migrate to their destinations in the cerebral cortex. Topics covered include radial migration, tangential migration, labelling techniques, and Cajal–Retzius cells. It is argued that the complexity added to the initial model of cortical development comes from the abundant populations recently discovered that use tangential migration. In turn, this reflects the intricate pattern of tangential movements during early telencephalic development. Although it was initially believed to be of little importance, this type of migration is fundamental during the earliest developmental stages.Less
This chapter discusses the cellular and molecular mechanisms by which neurons are generated from the ventricular zone in the forebrain and migrate to their destinations in the cerebral cortex. Topics covered include radial migration, tangential migration, labelling techniques, and Cajal–Retzius cells. It is argued that the complexity added to the initial model of cortical development comes from the abundant populations recently discovered that use tangential migration. In turn, this reflects the intricate pattern of tangential movements during early telencephalic development. Although it was initially believed to be of little importance, this type of migration is fundamental during the earliest developmental stages.
Amaya Miquelajáuregui and Alfredo Varela-Echavarría
- Published in print:
- 2008
- Published Online:
- May 2009
- ISBN:
- 9780195369007
- eISBN:
- 9780199865253
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780195369007.003.0003
- Subject:
- Neuroscience, Molecular and Cellular Systems, Development
This chapter discusses recent evidence on the genetic factors controlling Cajal–Retzius (C-R) cell production, differentiation, and migration during corticogenesis. Topics covered include genetic ...
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This chapter discusses recent evidence on the genetic factors controlling Cajal–Retzius (C-R) cell production, differentiation, and migration during corticogenesis. Topics covered include genetic determinants of C-R cell differentiation, routes of C-R cell migration, and subtypes of C-R cells generated by distinct progenitor domains. It is shown that C-R cells are a heterogeneous population formed by distinct subtypes generated in different focal sites at pallial and subpallial locations that migrate toward the dorsal pallium following stereotyped routes. C-R cell subtypes differ not only in their place of origin and migratory routes but also in their gene expression profile.Less
This chapter discusses recent evidence on the genetic factors controlling Cajal–Retzius (C-R) cell production, differentiation, and migration during corticogenesis. Topics covered include genetic determinants of C-R cell differentiation, routes of C-R cell migration, and subtypes of C-R cells generated by distinct progenitor domains. It is shown that C-R cells are a heterogeneous population formed by distinct subtypes generated in different focal sites at pallial and subpallial locations that migrate toward the dorsal pallium following stereotyped routes. C-R cell subtypes differ not only in their place of origin and migratory routes but also in their gene expression profile.
Alan J. McComas
- Published in print:
- 2011
- Published Online:
- September 2011
- ISBN:
- 9780199751754
- eISBN:
- 9780199897094
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199751754.003.0004
- Subject:
- Neuroscience, History of Neuroscience, Sensory and Motor Systems
After an adventurous boyhood, Ramon y Cajal is persuaded by his father to study medicine. Inspired by the results of the Golgi staining method, he commences a thorough study of the structure of the ...
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After an adventurous boyhood, Ramon y Cajal is persuaded by his father to study medicine. Inspired by the results of the Golgi staining method, he commences a thorough study of the structure of the nervous system, not only in man but in a variety of other species. Two of his conclusions are that the nerve cells are separate from each other, and that nerve impulses proceed from the dendrites to the axon. Frustrated with the limited recognition of his work, Cajal attends a meeting of anatomists in Germany and is finally accepted as a pioneer. Camillo Golgi, however, is skeptical of Cajal’s conclusions and makes this clear when they share the Nobel Prize in 1906.Less
After an adventurous boyhood, Ramon y Cajal is persuaded by his father to study medicine. Inspired by the results of the Golgi staining method, he commences a thorough study of the structure of the nervous system, not only in man but in a variety of other species. Two of his conclusions are that the nerve cells are separate from each other, and that nerve impulses proceed from the dendrites to the axon. Frustrated with the limited recognition of his work, Cajal attends a meeting of anatomists in Germany and is finally accepted as a pioneer. Camillo Golgi, however, is skeptical of Cajal’s conclusions and makes this clear when they share the Nobel Prize in 1906.
Tobias Rees
- Published in print:
- 2016
- Published Online:
- May 2016
- ISBN:
- 9780823266135
- eISBN:
- 9780823266975
- Item type:
- chapter
- Publisher:
- Fordham University Press
- DOI:
- 10.5422/fordham/9780823266135.003.0010
- Subject:
- Philosophy, Philosophy of Science
This chapter first focuses on Alain Prochiantz, professor at the École Normale Supérieure, and his lab’s efforts to think about the adult human brain in embryogenetic terms. It then covers the ...
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This chapter first focuses on Alain Prochiantz, professor at the École Normale Supérieure, and his lab’s efforts to think about the adult human brain in embryogenetic terms. It then covers the emergence of (cellular) cerebral pathology from 1820s to 1870s; Ramón y Cajal’s large-scale study of the cellular emergence of the brain in its entirety beginning in the early 1890s; the emergence of new concepts of plasticity and pathology in the mid-1960s; studies on the relevance of adult neurogenesis for rethinking the diseases of the brain, specifically depression; and the rise of adult neurogenesis research, arguably the fastest growing branch of neuroscience between 2000 and 2010.Less
This chapter first focuses on Alain Prochiantz, professor at the École Normale Supérieure, and his lab’s efforts to think about the adult human brain in embryogenetic terms. It then covers the emergence of (cellular) cerebral pathology from 1820s to 1870s; Ramón y Cajal’s large-scale study of the cellular emergence of the brain in its entirety beginning in the early 1890s; the emergence of new concepts of plasticity and pathology in the mid-1960s; studies on the relevance of adult neurogenesis for rethinking the diseases of the brain, specifically depression; and the rise of adult neurogenesis research, arguably the fastest growing branch of neuroscience between 2000 and 2010.
Santiago Ramon y Cajal
Javier DeFelipe and Edward G. Jones (eds)
- Published in print:
- 1991
- Published Online:
- March 2012
- ISBN:
- 9780195065169
- eISBN:
- 9780199847242
- Item type:
- book
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780195065169.001.0001
- Subject:
- Neuroscience, History of Neuroscience
This book is a reprint of an English translation of Cajal's original work, with abundant notes and commentaries by the editor. Cajal's fundamental contributions to neuroscience continue to be ...
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This book is a reprint of an English translation of Cajal's original work, with abundant notes and commentaries by the editor. Cajal's fundamental contributions to neuroscience continue to be important today and this account accurately details his ideas and data. The book also provides readers with the opportunity to learn what Cajal thought about his research career and the significance of his observations. Excerpts from Tello's memorial lectures also provide a contemporary view of Cajal's work.Less
This book is a reprint of an English translation of Cajal's original work, with abundant notes and commentaries by the editor. Cajal's fundamental contributions to neuroscience continue to be important today and this account accurately details his ideas and data. The book also provides readers with the opportunity to learn what Cajal thought about his research career and the significance of his observations. Excerpts from Tello's memorial lectures also provide a contemporary view of Cajal's work.
Javier DeFelipe and Edward G. Jones
- Published in print:
- 1991
- Published Online:
- March 2012
- ISBN:
- 9780195065169
- eISBN:
- 9780199847242
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780195065169.003.0001
- Subject:
- Neuroscience, History of Neuroscience
The scientific career of Santiago Ramón y Cajal's consisted of three major phases. He was occupied with studies of a rather general histological character carried out with conventional techniques. ...
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The scientific career of Santiago Ramón y Cajal's consisted of three major phases. He was occupied with studies of a rather general histological character carried out with conventional techniques. From his studies the foundations of the neuron doctrine were firmly laid. He was jointly the Nobel Prize for Physiology or Medicine with Golgi. Cajal makes it clear in his autobiography that he entered the field of neural regeneration with some reluctance and largely because he felt that the neuron doctrine was under attack. He formulated the theory of chemotactism. For him, the principle of neurotropism was one of the fundamental laws of neurogenesis. He was unimpressed by the limited capacity displayed by the cerebellar cortex for regeneration. He also concluded that the regenerative phenomena observed are on the whole temporary reactions.Less
The scientific career of Santiago Ramón y Cajal's consisted of three major phases. He was occupied with studies of a rather general histological character carried out with conventional techniques. From his studies the foundations of the neuron doctrine were firmly laid. He was jointly the Nobel Prize for Physiology or Medicine with Golgi. Cajal makes it clear in his autobiography that he entered the field of neural regeneration with some reluctance and largely because he felt that the neuron doctrine was under attack. He formulated the theory of chemotactism. For him, the principle of neurotropism was one of the fundamental laws of neurogenesis. He was unimpressed by the limited capacity displayed by the cerebellar cortex for regeneration. He also concluded that the regenerative phenomena observed are on the whole temporary reactions.
J.F. Tello
- Published in print:
- 1991
- Published Online:
- March 2012
- ISBN:
- 9780195065169
- eISBN:
- 9780199847242
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780195065169.003.0007
- Subject:
- Neuroscience, History of Neuroscience
When maximally differentiated, the nervous system to a large extent loses its vegetative capacities, especially that of multiplication, acquiring instead an exquisite sensitivity to any pathogenic ...
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When maximally differentiated, the nervous system to a large extent loses its vegetative capacities, especially that of multiplication, acquiring instead an exquisite sensitivity to any pathogenic action culminating in degeneration and death. Cajal dedicates more than twenty of the most important works of his third period to the study of degeneration and regeneration in the peripheral and central nervous system. Trophic form as a degeneration necessarily falls on those constitutive elements of the nerves which form the central trophic action and cannot persist without the axon and the myelin. From the works of Cajal, the phenomena that occur in a nerve in degeneration are admirably represented. In this chapter degeneration and regeneration in the white matter, degeneration and regeneration in the gray matter, and neurotropism in nerve regeneration will be also explained one by one.Less
When maximally differentiated, the nervous system to a large extent loses its vegetative capacities, especially that of multiplication, acquiring instead an exquisite sensitivity to any pathogenic action culminating in degeneration and death. Cajal dedicates more than twenty of the most important works of his third period to the study of degeneration and regeneration in the peripheral and central nervous system. Trophic form as a degeneration necessarily falls on those constitutive elements of the nerves which form the central trophic action and cannot persist without the axon and the myelin. From the works of Cajal, the phenomena that occur in a nerve in degeneration are admirably represented. In this chapter degeneration and regeneration in the white matter, degeneration and regeneration in the gray matter, and neurotropism in nerve regeneration will be also explained one by one.
Joseph D. Robinson
- Published in print:
- 2001
- Published Online:
- March 2012
- ISBN:
- 9780195137613
- eISBN:
- 9780199848164
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780195137613.003.0001
- Subject:
- Neuroscience, Molecular and Cellular Systems
This chapter describes selected developments between the meeting of the German Anatomical Society in Berlin in 1889 and the publication twenty years later of Santiago Ramón y Cajal's treatise on the ...
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This chapter describes selected developments between the meeting of the German Anatomical Society in Berlin in 1889 and the publication twenty years later of Santiago Ramón y Cajal's treatise on the regeneration in the nervous system. Cajal formulated one of the early arguments for the Neuron Theory from studying the embryological development of nerve cells, particularly the sequential growth of their processes. In the two decades following Cajal's mission to Berlin, a flourishing research program was established, rooted in the neuron, the fundamental morphological and functional unit of the nervous system.Less
This chapter describes selected developments between the meeting of the German Anatomical Society in Berlin in 1889 and the publication twenty years later of Santiago Ramón y Cajal's treatise on the regeneration in the nervous system. Cajal formulated one of the early arguments for the Neuron Theory from studying the embryological development of nerve cells, particularly the sequential growth of their processes. In the two decades following Cajal's mission to Berlin, a flourishing research program was established, rooted in the neuron, the fundamental morphological and functional unit of the nervous system.
Joseph D. Robinson
- Published in print:
- 2001
- Published Online:
- March 2012
- ISBN:
- 9780195137613
- eISBN:
- 9780199848164
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780195137613.003.0012
- Subject:
- Neuroscience, Molecular and Cellular Systems
This chapter focuses on the cellular changes required to produce experience-dependent alterations in neural function. This account is grounded on issues raised by Santiago Ramón y Cajal. His treatise ...
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This chapter focuses on the cellular changes required to produce experience-dependent alterations in neural function. This account is grounded on issues raised by Santiago Ramón y Cajal. His treatise on neuroanatomy catalogued in 1909 a range of proposals for cellular mechanisms. Cajal envisaged a reinforcement of existing pathways through repetitive use as well as the creation of new pathways by a “continued branching and growth of dendritic and axonal arborizations.” In 1917 C. U. Ariëns Kappers in Amsterdam developed this notion of neuronal growth. Associative learning, he argued, resulted from the synchronous stimulation of neurons, with axons growing toward dendrites already active. Learning required the same processes that he imagined to be involved in neural development.Less
This chapter focuses on the cellular changes required to produce experience-dependent alterations in neural function. This account is grounded on issues raised by Santiago Ramón y Cajal. His treatise on neuroanatomy catalogued in 1909 a range of proposals for cellular mechanisms. Cajal envisaged a reinforcement of existing pathways through repetitive use as well as the creation of new pathways by a “continued branching and growth of dendritic and axonal arborizations.” In 1917 C. U. Ariëns Kappers in Amsterdam developed this notion of neuronal growth. Associative learning, he argued, resulted from the synchronous stimulation of neurons, with axons growing toward dendrites already active. Learning required the same processes that he imagined to be involved in neural development.
Kenton M. Sanders and Tamas Ördög
- Published in print:
- 2003
- Published Online:
- November 2020
- ISBN:
- 9780195147889
- eISBN:
- 9780197561850
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/oso/9780195147889.003.0006
- Subject:
- Clinical Medicine and Allied Health, Gastroenterology
Gastric peristaltic contractions are the basis for emptying of solids from the stomach. These events begin in the mid to high corpus region, develop into a ring around ...
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Gastric peristaltic contractions are the basis for emptying of solids from the stomach. These events begin in the mid to high corpus region, develop into a ring around the stomach, and spread down the length of the stomach to the pylorus. The pressure wave resulting from gastric peristalsis pushes the contents of the stomach toward the pyloric sphincter, but a nearly simultaneous contraction of the ring of muscle in the pyloric canal and the terminal antrum ultimately forces much of the food in the retrograde direction, toward the body of the stomach. Sheer forces that develop as a result of this forceful retropulsion cause mechanical disruption of solid particles. Repetitive peristaltic contractions (e.g., in the human these events occur about 3 times per minute), over a period of time, reduces ingested foods to small particles. The action of gastric peristalsis in the distal stomach facilitates emptying and the reduced particle diameter aides in chemical digestion of foods in the small intestine. Pathophysiological conditions that disrupt or disorganize gastric peristalsis can impair or delay normal gastric emptying. Gastric peristaltic contractions result from depolarization of the plasma membranes of smooth muscle cells. For many years it has been known that gastric muscles display periodic (or rhythmic) electrical activity in which membrane potential oscillates between negative potentials and more depolarized levels. The oscillations in membrane potential are known as electrical slow waves (see Color Figs. 2.1 and 2.2 in separate color insert). Slow waves are generated within the tunica muscularis of the proximal corpus along the greater curvature of the stomach, and these events spread around the circumference and down the stomach to the pylorus. A greater velocity of propagation around the stomach than down the stomach causes development of a ring of excitation, and this is the electrical basis underlying gastric peristaltic contractions. Studies have shown that electrical slow waves are generated by specialized pacemaker cells, known as interstitial cells of Cajal (ICCs). The main pacemaker ICCs in the stomach form a dense network of electrically coupled cells between the circular and longitudinal muscle layers of the corpus and antrum.
Less
Gastric peristaltic contractions are the basis for emptying of solids from the stomach. These events begin in the mid to high corpus region, develop into a ring around the stomach, and spread down the length of the stomach to the pylorus. The pressure wave resulting from gastric peristalsis pushes the contents of the stomach toward the pyloric sphincter, but a nearly simultaneous contraction of the ring of muscle in the pyloric canal and the terminal antrum ultimately forces much of the food in the retrograde direction, toward the body of the stomach. Sheer forces that develop as a result of this forceful retropulsion cause mechanical disruption of solid particles. Repetitive peristaltic contractions (e.g., in the human these events occur about 3 times per minute), over a period of time, reduces ingested foods to small particles. The action of gastric peristalsis in the distal stomach facilitates emptying and the reduced particle diameter aides in chemical digestion of foods in the small intestine. Pathophysiological conditions that disrupt or disorganize gastric peristalsis can impair or delay normal gastric emptying. Gastric peristaltic contractions result from depolarization of the plasma membranes of smooth muscle cells. For many years it has been known that gastric muscles display periodic (or rhythmic) electrical activity in which membrane potential oscillates between negative potentials and more depolarized levels. The oscillations in membrane potential are known as electrical slow waves (see Color Figs. 2.1 and 2.2 in separate color insert). Slow waves are generated within the tunica muscularis of the proximal corpus along the greater curvature of the stomach, and these events spread around the circumference and down the stomach to the pylorus. A greater velocity of propagation around the stomach than down the stomach causes development of a ring of excitation, and this is the electrical basis underlying gastric peristaltic contractions. Studies have shown that electrical slow waves are generated by specialized pacemaker cells, known as interstitial cells of Cajal (ICCs). The main pacemaker ICCs in the stomach form a dense network of electrically coupled cells between the circular and longitudinal muscle layers of the corpus and antrum.
Antonio M. Battro
- Published in print:
- 2010
- Published Online:
- March 2016
- ISBN:
- 9780814741405
- eISBN:
- 9780814786550
- Item type:
- chapter
- Publisher:
- NYU Press
- DOI:
- 10.18574/nyu/9780814741405.003.0013
- Subject:
- Education, Educational Policy and Politics
This chapter describes the development of a neuroscience project at Ross informed by literature and art. This project explores how a metaphor can serve as a trigger for interdisciplinary work in a ...
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This chapter describes the development of a neuroscience project at Ross informed by literature and art. This project explores how a metaphor can serve as a trigger for interdisciplinary work in a school. Students started with Ramón y Cajal's scientific metaphor equating neurons to butterflies. This served as a launching pad for a series of scholarly investigations ranging from a linguistic analysis of the word butterfly in different contexts, to a review of scientific and other texts about butterflies, to time in the laboratory viewing neurons under the microscope. Students combined their skills about technology, art, neurobiology, and literature to create a digital video that converted the original metaphor into a living, visual form. This project illustrates the beauty of interdisciplinary learning, as well as the role of the spiral curriculum in transforming students' engagement in learning.Less
This chapter describes the development of a neuroscience project at Ross informed by literature and art. This project explores how a metaphor can serve as a trigger for interdisciplinary work in a school. Students started with Ramón y Cajal's scientific metaphor equating neurons to butterflies. This served as a launching pad for a series of scholarly investigations ranging from a linguistic analysis of the word butterfly in different contexts, to a review of scientific and other texts about butterflies, to time in the laboratory viewing neurons under the microscope. Students combined their skills about technology, art, neurobiology, and literature to create a digital video that converted the original metaphor into a living, visual form. This project illustrates the beauty of interdisciplinary learning, as well as the role of the spiral curriculum in transforming students' engagement in learning.
Rafael Yuste
- Published in print:
- 2010
- Published Online:
- August 2013
- ISBN:
- 9780262013505
- eISBN:
- 9780262259286
- Item type:
- book
- Publisher:
- The MIT Press
- DOI:
- 10.7551/mitpress/9780262013505.001.0001
- Subject:
- Neuroscience, Research and Theory
Most neurons in the brain are covered by dendritic spines, small protrusions that arise from dendrites, covering them like leaves on a tree. But a hundred and twenty years after spines were first ...
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Most neurons in the brain are covered by dendritic spines, small protrusions that arise from dendrites, covering them like leaves on a tree. But a hundred and twenty years after spines were first described by Ramón y Cajal, their function is still unclear. Dozens of different functions have been proposed, from Cajal's idea that they enhance neuronal interconnectivity to hypotheses that spines serve as plasticity machines, neuroprotective devices, or even digital logic elements. This book attempts to solve the “spine problem,” searching for the fundamental function of spines. The text does this by examining many aspects of spine biology that been sources of fascination over the years, including their structure, development, motility, plasticity, biophysical properties, and calcium compartmentalization. it argues that we may never understand how the brain works without understanding the specific function of spines. The book offers a synthesis of the information that has been gathered on spines (much of which comes from studies of the mammalian cortex), linking their function with the computational logic of the neuronal circuits that use them. It argues that once viewed from the circuit perspective, all the pieces of the spine puzzle fit together nicely into a single, overarching function. The book connects these two topics, integrating current knowledge of spines with that of key features of the circuits in which they operate. It concludes with a speculative chapter on the computational function of spines, searching for the ultimate logic of their existence in the brain.Less
Most neurons in the brain are covered by dendritic spines, small protrusions that arise from dendrites, covering them like leaves on a tree. But a hundred and twenty years after spines were first described by Ramón y Cajal, their function is still unclear. Dozens of different functions have been proposed, from Cajal's idea that they enhance neuronal interconnectivity to hypotheses that spines serve as plasticity machines, neuroprotective devices, or even digital logic elements. This book attempts to solve the “spine problem,” searching for the fundamental function of spines. The text does this by examining many aspects of spine biology that been sources of fascination over the years, including their structure, development, motility, plasticity, biophysical properties, and calcium compartmentalization. it argues that we may never understand how the brain works without understanding the specific function of spines. The book offers a synthesis of the information that has been gathered on spines (much of which comes from studies of the mammalian cortex), linking their function with the computational logic of the neuronal circuits that use them. It argues that once viewed from the circuit perspective, all the pieces of the spine puzzle fit together nicely into a single, overarching function. The book connects these two topics, integrating current knowledge of spines with that of key features of the circuits in which they operate. It concludes with a speculative chapter on the computational function of spines, searching for the ultimate logic of their existence in the brain.
Rafael Yuste
- Published in print:
- 2010
- Published Online:
- August 2013
- ISBN:
- 9780262013505
- eISBN:
- 9780262259286
- Item type:
- chapter
- Publisher:
- The MIT Press
- DOI:
- 10.7551/mitpress/9780262013505.003.0002
- Subject:
- Neuroscience, Research and Theory
This chapter narrates the discovery of dendritic spines. It begins with Santiago Ramón y Cajal, a Spanish professor of Pathology and Histology, and his work entitled Estractura delos centros ...
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This chapter narrates the discovery of dendritic spines. It begins with Santiago Ramón y Cajal, a Spanish professor of Pathology and Histology, and his work entitled Estractura delos centros nerviosos de la aves (Structure of the Nervous Centers in Birds) and how he discovered the spines using the Golgi technique. Cajal defined “spine” on the spines of a rose bush, as it resembled one when he first investigated it in Purkinje cells.Less
This chapter narrates the discovery of dendritic spines. It begins with Santiago Ramón y Cajal, a Spanish professor of Pathology and Histology, and his work entitled Estractura delos centros nerviosos de la aves (Structure of the Nervous Centers in Birds) and how he discovered the spines using the Golgi technique. Cajal defined “spine” on the spines of a rose bush, as it resembled one when he first investigated it in Purkinje cells.
Rafael Yuste
- Published in print:
- 2010
- Published Online:
- August 2013
- ISBN:
- 9780262013505
- eISBN:
- 9780262259286
- Item type:
- chapter
- Publisher:
- The MIT Press
- DOI:
- 10.7551/mitpress/9780262013505.003.0009
- Subject:
- Neuroscience, Research and Theory
The electrical aspect of the function of spines is explored in this chapter. Ramón y Cajal was the first one who proposed the idea of the electrical function of the spine, as he believed that the ...
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The electrical aspect of the function of spines is explored in this chapter. Ramón y Cajal was the first one who proposed the idea of the electrical function of the spine, as he believed that the spine stores electric energy (Ramón y Cajal, 1904). This hypothesis was picked up 50 years later by Chang, who suggested that spines have electrical resistance, hence can attenuate synaptic inputs. It then explained that there are two categories of electrical property models of spines: the active and passive, according to whether they assume the presence of voltage-dependent conductances in spines. The chapter concludes by explaining that the electrical roles of spines has important repercussions for the function of the neuron, and it is likely that better knowledge of the electrical role of spines will change the general understanding of how neurons work.Less
The electrical aspect of the function of spines is explored in this chapter. Ramón y Cajal was the first one who proposed the idea of the electrical function of the spine, as he believed that the spine stores electric energy (Ramón y Cajal, 1904). This hypothesis was picked up 50 years later by Chang, who suggested that spines have electrical resistance, hence can attenuate synaptic inputs. It then explained that there are two categories of electrical property models of spines: the active and passive, according to whether they assume the presence of voltage-dependent conductances in spines. The chapter concludes by explaining that the electrical roles of spines has important repercussions for the function of the neuron, and it is likely that better knowledge of the electrical role of spines will change the general understanding of how neurons work.
Tobias Rees
- Published in print:
- 2016
- Published Online:
- January 2017
- ISBN:
- 9780520288126
- eISBN:
- 9780520963177
- Item type:
- chapter
- Publisher:
- University of California Press
- DOI:
- 10.1525/california/9780520288126.003.0012
- Subject:
- Anthropology, Medical Anthropology
This chapter discusses the author's research methodology to address the question: What venues for living a life, for being neurologically human, have the neuronal sciences opened up since 1891, when ...
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This chapter discusses the author's research methodology to address the question: What venues for living a life, for being neurologically human, have the neuronal sciences opened up since 1891, when Wilhelm Waldeyer introduced the term neuron? He began by studying the genealogy of morals by turning to Santiago Ramón y Cajal, whose histology marked the emergence of the neurological human. What Ramón y Cajal then found when he set out to transform the development of the nervous system into a linear series of ink-pen drawings was that neurons must be thought of as instances of a free growth. From Ramón y Cajal, he then turned to German cytoarchitecture to study the cybernetic theories of the brain.Less
This chapter discusses the author's research methodology to address the question: What venues for living a life, for being neurologically human, have the neuronal sciences opened up since 1891, when Wilhelm Waldeyer introduced the term neuron? He began by studying the genealogy of morals by turning to Santiago Ramón y Cajal, whose histology marked the emergence of the neurological human. What Ramón y Cajal then found when he set out to transform the development of the nervous system into a linear series of ink-pen drawings was that neurons must be thought of as instances of a free growth. From Ramón y Cajal, he then turned to German cytoarchitecture to study the cybernetic theories of the brain.