The Origin and Development of the Nervous System
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| Partner: | buecher.de |
| Hersteller: | Forgotten Books (Child, Charles Manning) |
| Stand: | 2015-08-04 03:50:33 |
Produktbeschreibung
Excerpt from The Origin and Development of the Nervous System: From a Physiological Viewpoint Concerning the embryonic development and the evolution of nervous structure a large body of fact and hypothesis is at hand, but the problem of the origin of the nervous system as an organ of excitation, transmission, and integration has received much less attention. Irritability, that is, excitability, is commonly regarded as a fundamental property of living protoplasm, and it is often asserted that the nervous system does not represent a new function, added at a certain stage of development, or of evolution, to the original functional complex of the organism, but rather a development of the primitive mechanisms of excitation and transmission. Not infrequently, however, particularly within recent years, it has been maintained that the primary factors in physiological correlation and integration consist of chemical substances and their transportation by one means or another. These two conceptions are difficult to reconcile, for the one implies that excitation and transmission are primary factors in physiological correlation, the other that they are of secondary origin. As a matter of fact, we know that excitation and transmission occur in protoplasm in the absence of anything which we can identify as nervous structure; moreover, it is difficult to conceive a living organism incapable of at least some degree of excitation and transmission. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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