. Comparative anatomy. Anatomy, Comparative. THE NERVOUS SYSTEM 501 parietal lobe are the anterior and posterior central, the superior and inferior parietal, the submarginal, and the angular. The occipital lobe has lingual, fusiform in part, and lateral gyri; the temporal lobe superior, middle and inferior, hippocampal, and uncus. The g3n-us cinguli on the median surface of the hemispheres extends through frontal and parietal lobes. Covered by the parietal, frontal, and temporal lobes on the lateral side of the hemisphere is an insula, the surface of which is subdivided into short and long gyr
. Comparative anatomy. Anatomy, Comparative. THE NERVOUS SYSTEM 501 parietal lobe are the anterior and posterior central, the superior and inferior parietal, the submarginal, and the angular. The occipital lobe has lingual, fusiform in part, and lateral gyri; the temporal lobe superior, middle and inferior, hippocampal, and uncus. The g3n-us cinguli on the median surface of the hemispheres extends through frontal and parietal lobes. Covered by the parietal, frontal, and temporal lobes on the lateral side of the hemisphere is an insula, the surface of which is subdivided into short and long gyri. (Figs. 418, 419) VISUAL. 'OLFACTORY/^^/-^ —^^ ^ >f ACOUSTIC- ACOUSTIC C. TARSIER. D. MARMOSET. Fig. 416.—Diagrams of the brains of insectivores and of lower primates viewed from the left side. The figures show the increasing dominance of the centers of vision over those of smell. A. Brain of Jumping Shrew. B. Brain of Tree Shrew. C. Brain of the primate Tarsier. D. Brain of the Marmoset. (Redrawn after G. Elliot Smith.) Each lobe contains a restricted portion of a lateral ventricle. Con- nexion with the third ventricle is effected by an interventricular foramen or foramen of Monro. Corpus Striatum. The second portion of the telencephalon which undergoes striking changes and enlargement in the course of phylogenesis is the corpus striatum, so-called because of its striped appearance in sections. This striate body or basal ganglion arises as a local thickening of the ventro-lateral wall of the telencephalon. Like other parts of this division of the brain, the striate body is connected primarily with olfactory fibers and is an olfactory reflex center. The organ is poorly developed in cyclostomes; but is a well-marked swelling in elasmobranchs, with a paleostriatum and an epistriatum. (Figs. 414, 415) The amphibian brain, however, may be taken as the prototype of the vertebrate. Each hemisphere of the amphibian brain is divided. Please note that these images are extracted
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