Title: Anatomy of the cat
Identifier: anatomyofcatrje00reig (find matches)
Year: 1991 (1990s)
Authors: Reighard, Jacob Ellsworth, 1861-1942; Jennings, H. S. (Herbert Spencer), 1868-1947
Subjects: Cats; Mammals
Publisher: (Austin, TX) : BookLab, Inc.
Contributing Library: American Museum of Natural History Library
Digitizing Sponsor: Biodiversity Heritage Library

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358 NERyOUS SYSTEM. hemispheres dorsad of the 'tween-brain. Ventrad of the corpus callosum another secondary union has resulted in the produc- tion of the fornix (Fig. 143, ?/). y
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■ w ^^ Fig. 144.—Lateral Surface of the Brain. a, olfactory bulb; b, cerebral hemisphere; c, cerebellum; (/, medulla oblongata; e, tractus olfactorius; f, lobus pyriformis or Iractus postrhinali^; g, pons; //, trape- zium; /', pyramid; j, area elliptica; k, area ovalis. //, N. opticus; V, N. trigemi- nus; III, N. facialis; VIII, N. acusticus; IX, N. glossupharyngeus; X, N. vagus; XI, N. accessorius. i, sulcus pra;sylvius; 2, sulcus cruciatus; 3, sulcus ansatus; 4, sulcus lateralis; 5, sulcus suprasylvius; 6, sulcus anterior; 7, sulcus posterior; 8, sulcus rhinalis; 9, fissura Sylvii; 10, sulcus rhinalis posterior. External Features.—With increase in size-the mass of the cerebrum shows externally a tendency to divide into three lobes, one craniad, the frontal (Fig. 145, A)\ one caudoven- trad, the temporal (B); and one caudodorsad, the occipi- tal (C). The two latter are not distinctly marked off from one another. The limit between the temporal and frontal lobes is marked by a short deep fissure, the lateral fissure (fissura cerebri lateralis), or fissure of Sylvius (Fig. 144, 9; Fig. 145, a). Each lobe is thrown up into elevations or gyri, which are separated by grooves or sulci; these are described below. The homology of the cerebral gyri and sulci of the cat with those of man is in most cases uncertain. The sulci and gyri of the cerebral hemispheres may be described brieflv in their main features as follows: On the lateral surface of the hemisphere (Fig. 145) the lateral fissure (fissura cerebri lateralis), or fissure of Sylvius, separating temporal and frontal lobes, forms the most convenient point of departure for an understanding of the fissures. The fissure

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