Cellular Structure of the Human Cerebral Cortex

Download Cellular Structure of the Human Cerebral Cortex PDF Online Free

Author :
Publisher : Karger Medical and Scientific Publishers
ISBN 13 : 380559061X
Total Pages : 266 pages
Book Rating : 4.8/5 (55 download)

DOWNLOAD NOW!


Book Synopsis Cellular Structure of the Human Cerebral Cortex by : Constantin von Economo

Download or read book Cellular Structure of the Human Cerebral Cortex written by Constantin von Economo and published by Karger Medical and Scientific Publishers. This book was released on 2009-01-01 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: Originally published in German and French, the work is considered to be unsurpassed in both its scientific eloquence and accurate photographic documentation. Revising Brodmann's cortical parcellation system, von Economo took cytoarchitectonics to a new zenith.>The revised edition contains newly compiled tables with extensive quantitative data on the 107 cytoarchitectonic areas of Economo and Koskinas, plus all the 'transition' areas and full reproductions of the original microphotographs. It also contains the concluding chapter that appeared only in the 1929 English edition, with Economo's later views on cytoarchitectonic neuropathology and evolutionary neuroscience, enriched with material and figures from his later studies. Last but not least a newly discovered manuscript by Georg N. Koskinas, appears in English for the first time. In it, Economo's collaborator presents an insightful analysis of the 'General Part' of their larger textbook of cytoarchitectonics.

Cellular Structure of the Human Cerebral Cortex

Download Cellular Structure of the Human Cerebral Cortex PDF Online Free

Author :
Publisher : S. Karger AG (Switzerland)
ISBN 13 : 9783805590624
Total Pages : 0 pages
Book Rating : 4.5/5 (96 download)

DOWNLOAD NOW!


Book Synopsis Cellular Structure of the Human Cerebral Cortex by : Constantin Freiherr von Economo

Download or read book Cellular Structure of the Human Cerebral Cortex written by Constantin Freiherr von Economo and published by S. Karger AG (Switzerland). This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Originally published in German and French, the work is considered to be unsurpassed in both its scientific eloquence and accurate photographic documentation. Revising Brodmann's cortical parcellation system, von Economo took cytoarchitectonics to a new zenith. The revised edition contains newly compiled tables with extensive quantitative data on the 107 cytoarchitectonic areas of Economo and Koskinas, plus all the 'transition' areas and full reproductions of the original microphotographs. It also contains the concluding chapter that appeared only in the 1929 English edition, with Economo's later views on cytoarchitectonic neuropathology and evolutionary neuroscience, enriched with material and figures from his later studies. Last but not least a newly discovered manuscript by Georg N. Koskinas, appears in English for the first time. In it, Economo's collaborator presents an insightful analysis of the 'General Part' of their larger textbook of cytoarchitectonics.

Discovering the Brain

Download Discovering the Brain PDF Online Free

Author :
Publisher : National Academies Press
ISBN 13 : 0309045290
Total Pages : 195 pages
Book Rating : 4.3/5 (9 download)

DOWNLOAD NOW!


Book Synopsis Discovering the Brain by : National Academy of Sciences

Download or read book Discovering the Brain written by National Academy of Sciences and published by National Academies Press. This book was released on 1992-01-01 with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt: The brain ... There is no other part of the human anatomy that is so intriguing. How does it develop and function and why does it sometimes, tragically, degenerate? The answers are complex. In Discovering the Brain, science writer Sandra Ackerman cuts through the complexity to bring this vital topic to the public. The 1990s were declared the "Decade of the Brain" by former President Bush, and the neuroscience community responded with a host of new investigations and conferences. Discovering the Brain is based on the Institute of Medicine conference, Decade of the Brain: Frontiers in Neuroscience and Brain Research. Discovering the Brain is a "field guide" to the brainâ€"an easy-to-read discussion of the brain's physical structure and where functions such as language and music appreciation lie. Ackerman examines: How electrical and chemical signals are conveyed in the brain. The mechanisms by which we see, hear, think, and pay attentionâ€"and how a "gut feeling" actually originates in the brain. Learning and memory retention, including parallels to computer memory and what they might tell us about our own mental capacity. Development of the brain throughout the life span, with a look at the aging brain. Ackerman provides an enlightening chapter on the connection between the brain's physical condition and various mental disorders and notes what progress can realistically be made toward the prevention and treatment of stroke and other ailments. Finally, she explores the potential for major advances during the "Decade of the Brain," with a look at medical imaging techniquesâ€"what various technologies can and cannot tell usâ€"and how the public and private sectors can contribute to continued advances in neuroscience. This highly readable volume will provide the public and policymakersâ€"and many scientists as wellâ€"with a helpful guide to understanding the many discoveries that are sure to be announced throughout the "Decade of the Brain."

Atlas of Cytoarchitectonics of the Adult Human Cerebral Cortex

Download Atlas of Cytoarchitectonics of the Adult Human Cerebral Cortex PDF Online Free

Author :
Publisher : S. Karger AG (Switzerland)
ISBN 13 : 9783805582896
Total Pages : 0 pages
Book Rating : 4.5/5 (828 download)

DOWNLOAD NOW!


Book Synopsis Atlas of Cytoarchitectonics of the Adult Human Cerebral Cortex by : Constantin Freiherr von Economo

Download or read book Atlas of Cytoarchitectonics of the Adult Human Cerebral Cortex written by Constantin Freiherr von Economo and published by S. Karger AG (Switzerland). This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: First English edition of a rare gem in the neurological sciences A milestone in neuroscience research, this high-profile Atlas depicts the cellular structure of practically every area of the human cortex with direct applications to current research in brain function. The entirety of the 112 original microphotographic plates, brilliant achievements in scientific microphotography and representing the 107 cytoarchitectonic areas of the human cerebral cortex, are reproduced in full size - large enough to be used for teaching purposes. An extensive introduction places the cytoarchitectonic studies of von Economo and Koskinas in a historical as well as a modern perspective, summarizing the essence of their findings and providing Brodmann area correlations. Biographies of von Economo and Koskinas and complete listings of their hard-to-find works are included in the Appendix. Originally published in German in 1925, it was considered a 'royal gift to science'. Revising Brodmann's nomenclature of 1909, the Nobel prize nominee von Economo and his colleague Koskinas took cytoarchitectonics to a new zenith, filling in gaps left by Brodmann on normal cortical structure, and documenting detailed findings in the frontal, parietal, temporal and occipital lobes, the insula, hippocampus, and superior limbic region. Far from being of purely academic or historical interest, this essential guide for all research on the cerebral cortex is of fundamental value to investigators in the brain and behavioral sciences, including basic, cognitive and evolutionary neuroscience, neuroanatomy, neurophysiology, neuroimaging, neuropsychology and neurolinguistics, as well as to physicians in the clinical fields of neurology, neuropathology, neurosurgery and psychiatry.

Population Neuroscience

Download Population Neuroscience PDF Online Free

Author :
Publisher : Springer Science & Business Media
ISBN 13 : 3642364500
Total Pages : 198 pages
Book Rating : 4.6/5 (423 download)

DOWNLOAD NOW!


Book Synopsis Population Neuroscience by : Tomas Paus

Download or read book Population Neuroscience written by Tomas Paus and published by Springer Science & Business Media. This book was released on 2013-03-23 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: Is Newton’s brain different from Rembrandt’s? Does a mother’s diet during pregnancy impact brain growth? Do adolescent peers leave a signature in the social brain? Does the way we live in our middle years affect how our brains age? To answer these and many other questions, we can now turn to population neuroscience. Population neuroscience endeavors to identify environmental and genetic factors that shape the function and structure of the human brain; it uses the tools and knowledge of genetics (and the “omics” sciences), epidemiology and neuroscience. This text attempts to provide a bridge spanning these three disciplines so that their practitioners can communicate easily with each other when working together on large-scale imaging studies of the developing, mature and aging brain. By understanding the processes driving variations in brain function and structure across individuals, we will also be able to predict an individual’s risk of (or resilience against) developing a brain disorder. In the long term, the hope is that population neuroscience will lay the foundation for personalized preventive medicine and, in turn, reduce the burden associated with complex, chronic disorders of brain and body.

Brodmann's

Download Brodmann's PDF Online Free

Author :
Publisher : Springer Science & Business Media
ISBN 13 : 0387269193
Total Pages : 307 pages
Book Rating : 4.3/5 (872 download)

DOWNLOAD NOW!


Book Synopsis Brodmann's by : K. Brodmann

Download or read book Brodmann's written by K. Brodmann and published by Springer Science & Business Media. This book was released on 2007-02-16 with total page 307 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the third edition of the translation, by Laurence Garey, of "Vergleichende Lokalisationslehre der Grosshirnrinde" by Korbinian Brodmann, originally published by Barth-Verlag in Leipzig in 1909. It is one of the major "classics" of the neurological world. Even today it forms the basis for so-called "localisation" of function in the cerebral cortex. Brodmann's "areas" are still used to designate functional regions in the cortex, the part of the brain that brings the world that surrounds us into consciousness, and which governs our responses to the world. For example, we use "area 4" for the "motor" cortex, with which we control our muscles, "area 17" for "visual" cortex, with which we see, and so on. This nomenclature is used by neurologists and neurosurgeons in the human context, as well as by experimentalists in various animals. Indeed, Brodmann's famous "maps" of the cerebral cortex of humans, monkeys and other mammals must be among the most commonly reproduced figures in neurobiological publishing. The most famous of all is that of the human brain. There can be few textbooks of neurology, neurophysiology or neuroanatomy in which Brodmann is not cited, and his concepts pervade most research publications on systematic neurobiology. In spite of this, few people have ever seen a copy of the 1909 monograph, and even fewer have actually read it! There had never been a complete English translation available until the first edition of the present translation of 1994, and the original book had been almost unavailable for 50 years or more, the few antiquarian copies still around commanding high prices. As Laurence Garey, too, used Brodmann’s findings and maps in his neurobiological work, and had the good fortune to have access to a copy of the book, he decided to read the complete text and soon discovered that this was much more than just a report of laboratory findings of a turn-of-the-twentieth-century neurologist. It was an account of neurobiological thinking at that time, covering aspects of comparative neuroanatomy, neurophysiology and neuropathology, as well as giving a fascinating insight into the complex relationships between European neurologists during the momentous times when the neuron theory was still new.

Development of the Cerebral Cortex

Download Development of the Cerebral Cortex PDF Online Free

Author :
Publisher : John Wiley & Sons
ISBN 13 : 0470514817
Total Pages : 246 pages
Book Rating : 4.4/5 (75 download)

DOWNLOAD NOW!


Book Synopsis Development of the Cerebral Cortex by : Gregory R. Bock

Download or read book Development of the Cerebral Cortex written by Gregory R. Bock and published by John Wiley & Sons. This book was released on 2008-04-30 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book details the rapidly advancing research on the development of the cerebral cortex. Topics covered include: new physiological data showing patterns in developing cortical organization; abnormalities of cortical development associated with psychiatric disorders; and research on cell identity and regionalization of the cortex.

The Microstructural Border Between the Motor and the Cognitive Domain in the Human Cerebral Cortex

Download The Microstructural Border Between the Motor and the Cognitive Domain in the Human Cerebral Cortex PDF Online Free

Author :
Publisher : Springer Science & Business Media
ISBN 13 : 3642189105
Total Pages : 92 pages
Book Rating : 4.6/5 (421 download)

DOWNLOAD NOW!


Book Synopsis The Microstructural Border Between the Motor and the Cognitive Domain in the Human Cerebral Cortex by : Stefan Geyer

Download or read book The Microstructural Border Between the Motor and the Cognitive Domain in the Human Cerebral Cortex written by Stefan Geyer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the last years, numerous studies have provided new insights into the structural and functional organization of the human cortical motor system. The data reviewed in this book indicate that striking similarities have been found between humans and non-human primates.

The Cortical Neuron

Download The Cortical Neuron PDF Online Free

Author :
Publisher :
ISBN 13 : 019508330X
Total Pages : 424 pages
Book Rating : 4.1/5 (95 download)

DOWNLOAD NOW!


Book Synopsis The Cortical Neuron by : Michael Joseph Gutnick

Download or read book The Cortical Neuron written by Michael Joseph Gutnick and published by . This book was released on 1995 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: To understand how the cerebral cortex functions requires knowledge of single cells in this region and of their organization into cortical networks. Looking beyond the classical "wiring diagram" description of the organization of cortical cells into circuits, this innovative work focuses ondynamic aspects of cerebral cortical physiology, both at the single-neuron and network levels. Recent years have seen a remarkable expansion of knowledge about the basic cellular physiology and molecular biology of cortical neurons--their membrane properties, their synaptic characteristics, theirfunctional connectivity, their development, and the mechanisms of their response to injury. This authoritative volume includes contributions by many of the renowned neurobiologists and neurologists directly responsible for these advances. It is divided into four main sections, each of which isprefaced with an overview by a leading expert in the field. The sections cover cortical neurons and synapses, the cortical network, the developing cortical neuron, and the vulnerable cortical neuron. This final section focuses on the cortical neuron in relation to the mechanisms of epilepsy.Together, the chapters provide a balanced, up-to-date, multidisciplinary perspective on the normal and pathological function of the cells of the cerebral cortex, identifying the controversies and critical issues facing modern researchers in this exciting field.

The Cerebral Circulation

Download The Cerebral Circulation PDF Online Free

Author :
Publisher : Biota Publishing
ISBN 13 : 1615047239
Total Pages : 82 pages
Book Rating : 4.6/5 (15 download)

DOWNLOAD NOW!


Book Synopsis The Cerebral Circulation by : Marilyn J. Cipolla

Download or read book The Cerebral Circulation written by Marilyn J. Cipolla and published by Biota Publishing. This book was released on 2016-07-28 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: This e-book will review special features of the cerebral circulation and how they contribute to the physiology of the brain. It describes structural and functional properties of the cerebral circulation that are unique to the brain, an organ with high metabolic demands and the need for tight water and ion homeostasis. Autoregulation is pronounced in the brain, with myogenic, metabolic and neurogenic mechanisms contributing to maintain relatively constant blood flow during both increases and decreases in pressure. In addition, unlike peripheral organs where the majority of vascular resistance resides in small arteries and arterioles, large extracranial and intracranial arteries contribute significantly to vascular resistance in the brain. The prominent role of large arteries in cerebrovascular resistance helps maintain blood flow and protect downstream vessels during changes in perfusion pressure. The cerebral endothelium is also unique in that its barrier properties are in some way more like epithelium than endothelium in the periphery. The cerebral endothelium, known as the blood-brain barrier, has specialized tight junctions that do not allow ions to pass freely and has very low hydraulic conductivity and transcellular transport. This special configuration modifies Starling's forces in the brain microcirculation such that ions retained in the vascular lumen oppose water movement due to hydrostatic pressure. Tight water regulation is necessary in the brain because it has limited capacity for expansion within the skull. Increased intracranial pressure due to vasogenic edema can cause severe neurologic complications and death.

The Neocortex

Download The Neocortex PDF Online Free

Author :
Publisher : MIT Press
ISBN 13 : 0262043246
Total Pages : 449 pages
Book Rating : 4.2/5 (62 download)

DOWNLOAD NOW!


Book Synopsis The Neocortex by : Wolf Singer

Download or read book The Neocortex written by Wolf Singer and published by MIT Press. This book was released on 2019-10-29 with total page 449 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experts review the latest research on the neocortex and consider potential directions for future research. Over the past decade, technological advances have dramatically increased information on the structural and functional organization of the brain, especially the cerebral cortex. This explosion of data has radically expanded our ability to characterize neural circuits and intervene at increasingly higher resolutions, but it is unclear how this has informed our understanding of underlying mechanisms and processes. In search of a conceptual framework to guide future research, leading researchers address in this volume the evolution and ontogenetic development of cortical structures, the cortical connectome, and functional properties of neuronal circuits and populations. They explore what constitutes “uniquely human” mental capacities and whether neural solutions and computations can be shared across species or repurposed for potentially uniquely human capacities. Contributors Danielle S. Bassett, Randy M. Bruno, Elizabeth A. Buffalo, Michael E. Coulter, Hermann Cuntz, Stanislas Dehaene, James J. DiCarlo, Pascal Fries, Karl J. Friston, Asif A. Ghazanfar, Anne-Lise Giraud, Joshua I. Gold, Scott T. Grafton, Jennifer M. Groh, Elizabeth A. Grove, Saskia Haegens, Kenneth D. Harris, Kristen M. Harris, Nicholas G. Hatsopoulos, Tarik F. Haydar, Takao K. Hensch, Wieland B. Huttner, Matthias Kaschube, Gilles Laurent, David A. Leopold, Johannes Leugering, Belen Lorente-Galdos, Jason N. MacLean, David A. McCormick, Lucia Melloni, Anish Mitra, Zoltán Molnár, Sydney K. Muchnik, Pascal Nieters, Marcel Oberlaender, Bijan Pesaran, Christopher I. Petkov, Gordon Pipa, David Poeppel, Marcus E. Raichle, Pasko Rakic, John H. Reynolds, Ryan V. Raut, John L. Rubenstein, Andrew B. Schwartz, Terrence J. Sejnowski, Nenad Sestan, Debra L. Silver, Wolf Singer, Peter L. Strick, Michael P. Stryker, Mriganka Sur, Mary Elizabeth Sutherland, Maria Antonietta Tosches, William A. Tyler, Martin Vinck, Christopher A. Walsh, Perry Zurn

Cortical Circuits

Download Cortical Circuits PDF Online Free

Author :
Publisher : Springer Science & Business Media
ISBN 13 :
Total Pages : 248 pages
Book Rating : 4.3/5 (91 download)

DOWNLOAD NOW!


Book Synopsis Cortical Circuits by : Edward L. White

Download or read book Cortical Circuits written by Edward L. White and published by Springer Science & Business Media. This book was released on 1989 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: This elegant book presents current evidence on the organization of the mammalian cerebral cortex. The focus on synapses and their function provides the basis for understanding how this critical part of the brain could work. Dr. White and his colleague Dr. Keller have collated an impressive mass of material. This makes the crucial information accessible and coherent. Dr. White pioneered an area of investigation that to most others, and occasionally to himself, seemed a bottomless pit of painstaking at tention to detail for the identification and enumeration of cortical syn apses. I do not recall that he or anyone else suspected, when he began to publish his now classic papers, that the work would be central to an accelerating convergence of information and ideas from neurobiology and computer science, especially artificial intelligence (AI) (Rumelhart and McClelland, 1986). The brain is the principal organ responsible for the adaptive capacities of animals. What has impressed students of biology, of medicine, and, to an extent, of philosophy is the correlation between the prominence of the cerebral cortex and the adaptive "complexity" of a particular spe cies. Most agree that the cortex is what sets Homo sapiens apart from other species quantitatively and qualitatively (Rakic, 1988). This is summarized in the first chapter.

Fiber Pathways of the Brain

Download Fiber Pathways of the Brain PDF Online Free

Author :
Publisher : OUP USA
ISBN 13 : 0195388267
Total Pages : 674 pages
Book Rating : 4.1/5 (953 download)

DOWNLOAD NOW!


Book Synopsis Fiber Pathways of the Brain by : Jeremy D. Schmahmann

Download or read book Fiber Pathways of the Brain written by Jeremy D. Schmahmann and published by OUP USA. This book was released on 2009-02-11 with total page 674 pages. Available in PDF, EPUB and Kindle. Book excerpt: The text is enriched throughout by close attention to functional aspects of the anatomical observations."--Jacket.

Development and Plasticity of the Brain

Download Development and Plasticity of the Brain PDF Online Free

Author :
Publisher : Oxford University Press, USA
ISBN 13 : 9780195023084
Total Pages : 382 pages
Book Rating : 4.0/5 (23 download)

DOWNLOAD NOW!


Book Synopsis Development and Plasticity of the Brain by : Raymond D. Lund

Download or read book Development and Plasticity of the Brain written by Raymond D. Lund and published by Oxford University Press, USA. This book was released on 1978 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book looks at the development and maintenance of organization in the nervous system of vertebrates, emphasizing the dynamic properties of nerve cells.

Cellular and Molecular Control of Neuronal Migration

Download Cellular and Molecular Control of Neuronal Migration PDF Online Free

Author :
Publisher : Springer Science & Business Media
ISBN 13 : 940077687X
Total Pages : 186 pages
Book Rating : 4.4/5 (7 download)

DOWNLOAD NOW!


Book Synopsis Cellular and Molecular Control of Neuronal Migration by : Laurent Nguyen

Download or read book Cellular and Molecular Control of Neuronal Migration written by Laurent Nguyen and published by Springer Science & Business Media. This book was released on 2013-11-18 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cellular and Molecular Control of Neuronal Migration provides an up-to-date collection of reviews on the molecular and cellular principles of neuronal migration in the mammalian brain. Over the last decades a rich catalogue of signaling molecules controlling neuronal migration has been compiled, and within this book an international panel of experts provides up-to-date discussions of the state of knowledge how these distinct signaling pathways regulate various aspects of neuronal migration. This book introduces the reader to the latest discoveries and concepts of neuronal migration enabled through the application of most sophisticated methods and cutting edge experimental approaches. Cellular and Molecular Control of Neuronal Migration also provides an update on the underlying cellular and molecular basis of neurodevelopmental migration disorders in human patients for all interested neuroscientists and clinicians.

Principles of Cellular, Molecular, and Developmental Neuroscience

Download Principles of Cellular, Molecular, and Developmental Neuroscience PDF Online Free

Author :
Publisher : Springer Science & Business Media
ISBN 13 : 9780387968032
Total Pages : 274 pages
Book Rating : 4.9/5 (68 download)

DOWNLOAD NOW!


Book Synopsis Principles of Cellular, Molecular, and Developmental Neuroscience by : Oswald Steward

Download or read book Principles of Cellular, Molecular, and Developmental Neuroscience written by Oswald Steward and published by Springer Science & Business Media. This book was released on 1989 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of cellular, molecular, and developmental neuroscience repre sents the interface between the three large, well established fields of neu roscience, cell biology, and molecular biology. In the last 10 to 15 years, this new field has emerged as one of the most rapidly growing and exciting subdisciplines of neuroscience. It is now becoming possible to understand many aspects of nervous system function at the molecular level, and there already are dramatic applications of this information to the treatment of nervous system injury, disease, and genetic disorders. Moreover, there is great optimism that new strategies will emerge soon as a result of the explosion of information. This book was written to introduce students to the major issues, ex perimental strategies, and current knowledge base in cellular, molecular, and developmental neuroscience. The concept for the book arose from a section of an introductory neuroscience course given to first-year medical students at the University of Virginia School of Medicine. The text pre sumes a basic, but not detailed, understanding of nervous system orga nization and function, and a background in biology. It is intended as an appropriate introductory text for first-year medical students or graduate students in neuroscience, neurobiology, psychobiology, or related pro grams;··and for advanced undergraduate students with appropriate back ground in biology and neuroscience. While some of the specific information presented undoubtedly will be outdated rapidly, the "gestalt" of this emerging field of inquiry as presented here should help the beginning stu dent organize new information.

The Cellular Structure of the Mammalian Nervous System

Download The Cellular Structure of the Mammalian Nervous System PDF Online Free

Author :
Publisher : Springer
ISBN 13 :
Total Pages : 340 pages
Book Rating : 4.3/5 (91 download)

DOWNLOAD NOW!


Book Synopsis The Cellular Structure of the Mammalian Nervous System by : Harold Hillman

Download or read book The Cellular Structure of the Mammalian Nervous System written by Harold Hillman and published by Springer. This book was released on 1986-03-31 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: It would seem an appropriate time to re-examine the cellular structure of the mammalian nervous system for the following reasons. Firstly, there is considerable confusion in the literature about the appearance of the different kinds of neuroglia by light and by electron microscopy, and this is complemented by widespread disagreements among distinguished neuropathologists about the international classification of tumours of the central nervous system. Secondly, there is an increasing volume of experiments on the physiology and biochemistry of tissue cultures of neurons and different kinds of neuroglia, whose validity depends upon the accurate identification of both the parent tissue and also of the cells subsequently growing in culture. The biochemical classifica tion in recent years has often tended to become independent of the cellular identification, which makes the use of the neuroglial cell names doubtful and the significance of the biochemical properties of the cells difficult to relate to the physiological properties in vitro or in vivo (Table 1).