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Author: Leslie Iversen
Publisher: Springer Science & Business Media
ISBN: 1468431773
Category : Psychology
Languages : en
Pages : 393
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Book Description
Author: Leslie Iversen
Publisher: Springer Science & Business Media
ISBN: 1468431773
Category : Psychology
Languages : en
Pages : 393
Get Book Here
Book Description
Author: Maria Elisa Calcagnotto
Publisher: Frontiers Media SA
ISBN: 2889458911
Category :
Languages : en
Pages : 136
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Book Description
Author: Francisco F. De-Miguel
Publisher: Frontiers E-books
ISBN: 2889191095
Category :
Languages : en
Pages : 152
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Book Description
Extrasynaptic transmission is a unifying term for a wide variety of cellular processes, in which outside of synaptic terminals transmitter substances activate extrasynaptic receptors. Whereas “synaptic transmission” immediately refers to a process occurring at nerve terminals in which the arrival of a presynaptic impulse evokes exocytosis followed by a postsynaptic response within a millisecond time scale, extrasynaptic transmission has a wide diversity of ultrastructural and therefore mechanistic associated phenomena. In comparison to synaptic, extrasynaptic exocytosis may last for seconds or even minutes, thus expanding the timing of neuronal signaling. Extrasynaptic transmission has now been demonstrated in central and peripheral neurons of vertebrates and invertebrates, and involves many different types of transmitter substances than include low molecular weight transmitters (acetilcholine, GABA, glutamate, ATP, and biogenic amines) and peptides (substance P, vasopressin and others). It may occur when transmitters leak out from the synaptic cleft and activate extrasynaptic receptors in neighboring neurons or glial cells, or when axonal varicosities, dendrites or the somata release transmitters in the absence of postsynaptic counterparts. The release mechanisms also vary from one neuron type to another and from one neuronal compartment to another. In some cases, clear vesicles are apposed to the resting plasma membrane, as in presynaptic terminals. In other cases, transmitters are packed onto dense core vesicles that rest at a distance from the release sites. In between, there are multiple morphological combinations that point to complementary mechanisms in different compartments of the same neuron and some times, even in the same compartment. For example, serotonergic varicosities may combine clear and dense core vesicles in stereotyped arrays. This diversity adds complexity to the nervous system and raises many questions that are waiting for answers. Extrasynaptic transmission may be the main source of transmitter molecules causing volume transmission, however this still lacks direct demonstration. From the physiological point of view, one may ask how does the neuronal firing pattern evokes synaptic or extrasynaptic transmitter release or what are the physiological effects of these modes of transmission. From the behavioral point of view it becomes interesting to explore how circuits and therefore behaviors are modulated. Some neurological disfunctions may also be related to deficiencies in extrasynaptic transmission, however, again, direct studies are still lacking. Developmental and evolutionary biologists may also find the topic inspiring. Extrasynaptic transmission not only expands our view about how the nervous system works, but also requires a change in the way we plan our research. New technological and computational tools are now being applied to analyze intracellular and extracellular transmitter mobilizations or long term changes of neuronal circuits. New definitions and mechanisms may become visible. In the meanwhile, this seems to be a good moment for a first common effort to analyze and discuss extrasynaptic transmission in different systems and from different perspectives.
Author: Thomas C. Südhof
Publisher: Springer Science & Business Media
ISBN: 3540748059
Category : Medical
Languages : en
Pages : 582
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Book Description
It has been known for half a century that neurotransmitters are released in preformed quanta, that the quanta represent transmitter-storing vesicles, and that release occurs by exocytosis. The focus of this book is twofold. In the first part, the molecular events of exocytosis are analysed. In the second part of the book, the presynaptic receptors for endogenous chemical signals are presented that make neurotransmitter release a highly regulated process.
Author: Wulfram Gerstner
Publisher: Cambridge University Press
ISBN: 1107060834
Category : Computers
Languages : en
Pages : 591
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Book Description
This solid introduction uses the principles of physics and the tools of mathematics to approach fundamental questions of neuroscience.
Author: Andrea Volterra
Publisher: Oxford University Press, USA
ISBN: 9780198508540
Category : Medical
Languages : en
Pages : 272
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Book Description
Accompanying CD-ROM contains ... "additional images, movies, and animated sequences." -- p. [4] of cover.
Author: Adam C. Errington
Publisher: Springer
ISBN: 149391426X
Category : Medical
Languages : en
Pages : 301
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Book Description
GABA is the principal inhibitory neurotransmitter in the CNS and acts via GABAA and GABAB receptors. Recently, a novel form of GABAA receptor-mediated inhibition, termed “tonic” inhibition, has been described. Whereas synaptic GABAA receptors underlie classical “phasic” GABAA receptor-mediated inhibition (inhibitory postsynaptic currents), tonic GABAA receptor-mediated inhibition results from the activation of extrasynaptic receptors by low concentrations of ambient GABA. Extrasynaptic GABAA receptors are composed of receptor subunits that convey biophysical properties ideally suited to the generation of persistent inhibition and are pharmacologically and functionally distinct from their synaptic counterparts. This book highlights ongoing work examining the properties of recombinant and native extrasynaptic GABAA receptors and their preferential targeting by endogenous and clinically relevant agents. In addition, it emphasizes the important role of extrasynaptic GABAA receptors in GABAergic inhibition throughout the CNS and identifies them as a major player in both physiological and pathophysiological processes.
Author: Marzia Malcangio
Publisher: Springer
ISBN: 9781441902252
Category : Medical
Languages : en
Pages : 504
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Book Description
Primary sensory neurons respond to peripheral stimulation and project to the spinal cord. Specifically, the population of neurons which respond to damaging stimuli terminate in the superficial layers of the dorsal horn. Therefore, the dorsal horns constitute the first relay site for nociceptive fibre terminals which make synaptic contacts with second order neurons. It has recently become clear that the strength of this first pain synapse is plastic and modifiable by several modulators, including neuronal and non-neuronal regulators, and studies on the fundamental processes regulating the plasticity of the first pain synapse have resulted in the identification of new targets for the treatment of chronic pain. This book will be of interest to a wide readership in the pain field.
Author: Helmut L. Haas
Publisher: Springer Science & Business Media
ISBN: 364273202X
Category : Medical
Languages : en
Pages : 219
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Book Description
This is the second time that I have had the honor of opening an interna tional symposium dedicated to the functions of the hippocampus here in Pecs. It was a pleasure to greet the participants in the hope that their valuable contributions will make this meeting a tradition in this town. As one of the hosts of the symposium, I had the sorrowful duty to remind you of the absence of a dear colleague, Professor Graham God dard. His tragic and untimely death represents the irreparable loss of both a friend and an excellent researcher. This symposium is dedicated to his memory. If I compare the topics of the lectures of this symposium with those of the previous one, a striking difference becomes apparent. A dominating tendency of the previous symposium was to attempt to define hippocam pal function or to offer data relevant to supporting or rejecting existing theoretical positions. No such tendency is reflected in the titles of the present symposium, in which most of the contributions deal with hip pocampal phenomena at the most elementary level. Electrical, biochemi cal, biophysical, and pharmacological events at the synaptic, membrane, or intracellular level are analyzed without raising the question of what kind of integral functions these elementary phenomena are a part of.
Author: Satoru Otani
Publisher: Springer Science & Business Media
ISBN: 1402077661
Category : Medical
Languages : en
Pages : 331
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Book Description
The prefrontal cortex is regarded by many as the executive controller, which determines appropriate coupling between a sensory input and motor output to meet environmental demands. Our cognitive ability heavily relies on the function of the prefrontal cortex. Prefrontal Cortex: From Synaptic Plasticity to Cognition takes an interdisciplinary approach to characterize the function of the anterior portion of the frontal lobe in rodents and human and non-human primates. The topics in this volume are diverse. They range from membrane properties of prefrontal neurons to cognitive psychology and attempt to encompass domains of the prefrontal field in an effort to provide the bigger picture.
