Principles of Physiology, General and Comparative

Principles of Physiology, General and Comparative

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1851 edition. Excerpt: ...two sides, is but very little developed in the Rodentia, and scarcely at all in the Marsupialia; its place is in some degree supplied, however, by the higher development of the anterior commissure, whose connection, however, is not so much with the cerebral hemispheres, as with the corpora striata. As we ascend the series, however, we find the Cerebrum increasing in size, and lecoming more and more elongated posteriorly, by the development of the middle lobes; coincidently with which the corpus callosum is developed. No vestige of the posterior lobes is Been, however, until we ascend as far as the Carnivora; and even in that group they are present in merely a rudimentary form. This rudiment is somewhat enlarged in the Quadrumana; but it is only in Man that the posterior lobes attain such a development, as to cause the Cerebrum to cover-in, not merely the Sensory Ganglia, but also the Cerebellum. It will lie hereafter shown that the evolution of the Cerebrum in the Human foetus presents a series of pliases, which arc fairly comparable with the foregoing.--The inferior development of the Cerebrum in the lower orders of Mammalia, is marked also by the deficiency of those ' convolutions, ' which, in the hijrlier trilies, greatly increase the surface of grey matter, and also allow the Ulood-vcssels to come into contact with it over a much larger extent. These are entirely absent in the brains of the Implacental Mammals; the furrows present themselves only as a few shallow depressions in the Rodentia; their number increases in the Carnivore, being greater in the Dog than in the Feline tribe; among the Herbivorous Mammals, it is most considerable in the Horse and the Elephant; whilst it is in the higher Quadrumana, that the convoluted arrangement of the...
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Product details

  • Paperback | 600 pages
  • 189 x 246 x 31mm | 1,057g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236525612
  • 9781236525611