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Home > Art, Film & Photography > The Nervous System of Vertebrates
The Nervous System of Vertebrates

The Nervous System of Vertebrates


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About the Book

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. 1906 Excerpt: ...show the relations of the secondary gustatory tract and the valvula cerebelli. of the body in terrestrial animals, and in amphibia, reptiles, birds and mammals they are confined to the mouth cavity. Besides the great modification in structure of the gustatory system which this change entailed, a great change in function has been brought about. In primitive fishes the taste organs in mouth and pharynx detected indications of food brought by the respiratory water current. In fishes where the taste buds are situated on the surface of the body they serve to detect the presence of food, and frequently special organs such as the barblets about the mouth, or the fins, are richly provided with taste buds and are dragged about on the bottom or otherwise used in the active search for food. In short, the function of the taste organs of fish-like vertebrates is to detect food and to discover its location. In terrestrial animals, on the other hand, the taste organs in the mouth can rarely be used in the search for food. Their only service is to test the food after it is taken into the mouth to discover if it is desirable to eat. Terrestrial vertebrates depend chiefly on the senses of smell and sight for finding food. This explains the relatively Fig. 92.--A diagram representing the centers and tracts related to the visceral sensory components in fishes. slight importance of the sense of taste and the small size of its apparatus in higher vertebrates. At the same time, in higher vertebrates the general visceral system has been reduced in the head by the loss of the gills and more highly developed in the trunk in connection with the sympathetic system. A comparison of the diagram for the visceral and gustatory apparatus with those for the general and special cutaneous app...


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Product Details
  • ISBN-13: 9781153052436
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 106
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 1153052431
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 204 gr


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