. Comparative anatomy. Anatomy, Comparative. THE NERVOUS SYSTEM 491 Sympathetic nerve cords or connectives unite the series of sympathetic ganglia. Reptiles. The cerebral hemispheres of reptiles are larger than those of amphibia and by extension caudad have partially overgrown the diencephalon. The paired ventricles are nearly obliterated by the enlarge- ment of the striate bodies, archistriatum and neostriatum. For the first time in the vertebrate series, a cortical layer of pyramidal cells appears in the pallium, having nervous connexions with fibers of the. Fig. 407.—Brain of goose, ac, ant
. Comparative anatomy. Anatomy, Comparative. THE NERVOUS SYSTEM 491 Sympathetic nerve cords or connectives unite the series of sympathetic ganglia. Reptiles. The cerebral hemispheres of reptiles are larger than those of amphibia and by extension caudad have partially overgrown the diencephalon. The paired ventricles are nearly obliterated by the enlarge- ment of the striate bodies, archistriatum and neostriatum. For the first time in the vertebrate series, a cortical layer of pyramidal cells appears in the pallium, having nervous connexions with fibers of the. Fig. 407.—Brain of goose, ac, anterior commissure; cb, cerebellum; e, epiphysis; /, flocculus; h, hypophysis; hs, hyperstriatum; i, infundibulum; I, lateral ventricle; m, medulla oblongata; 7ns, mesostriatum; ob, olfactory bulb; ol, optic lobe; s, striatum; I, temporal lobe; III, third ventricle; x, plane of section E. (From Kingsley's "Com- parative Anatomy of Vertebrates," after Biitschli.) oKactory tract. Septum and hippocampus appear in the medial wall much as in amphibia. The dorsal wall of each hemisphere is homologized with the gyrus dentatus of the mammalian brain. The transitional region between this dorsal pallium and the neostriatum has important potentialities, since it is unconnected with olfactory fibers, and since in mammals it becomes the neopallium from which develops the greater part of the cerebral cortex on which the higher psychical activities of man depend. (Figs. 406, 414) In the region of the diencephalon of lizards the anterior epiphysial outgrowth, the parietal organ, develops a lens, retinal and pigment layers, and nerve fibers which are connected with centers in the brain Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wil
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