Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0201clau Year: 1884 282 MAMMALIA. The nervous system (fig. 671) is characterised by the size and high development of the brain, the hemispheres of which are so large that they not only fill the anterior part of the cranial cavity, but even Lo -II FIG. 671.—Brains of Mammalia, u, Brain of rabbit, from above ; the roof of tlie right hemi- sphere is removed so as to expose the lateral ventricle. I, The same from below, c, Brain of cat; on the right side the lateral and posterior part of the hemisphere is re
Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0201clau Year: 1884 282 MAMMALIA. The nervous system (fig. 671) is characterised by the size and high development of the brain, the hemispheres of which are so large that they not only fill the anterior part of the cranial cavity, but even Lo -II FIG. 671.—Brains of Mammalia, u, Brain of rabbit, from above ; the roof of tlie right hemi- sphere is removed so as to expose the lateral ventricle. I, The same from below, c, Brain of cat; on the right side the lateral and posterior part of the hemisphere is removed, and almost as much on the left side, and the greater part of the hemispheres of the cerebellum have been removed, d, Brain of orang («, I, c, after Gegenbaur; d, from the regne animal). I'll, cerebral hemispheres; Mil, corpus quadrigeminum,; Cl, cerebellum; .Mb, [.medulla oblougata; Lo, olfactory.'lobe; //, optic nerve; T' N, tri- geminal ; VII VIII, facial and auditory nerves; H, hypophysis cerebri; Th, optic thalamus; Si', sinus rhomboidalis. partly cox ei- the cerebellum. In the Marsupials and Monotremes the surface of the hemispheres is still smooth; but in the Edentates, Rodents, and Insectivores it is marked by depi-essions and ridgr*. which in the higher forms become regular furrows (sulci) and convo-
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