. Comparative anatomy. Anatomy, Comparative. 490 COMPARATIVE ANATOMY wall, the dorsal half is the archicortex or primordium hippocampi. The medio-ventral wall forms the septum by which fibers pass to and from the hippocampus. The hemispheres are interconnected by anterior, anterior pallial and posterior pallial commissures located in the lamina terminalis. Habenular and posterior commissures persist in the roof of the dien- cephalon. The epiphysis forms a pineal gland. A chorioid plexus. Fig. 406.—Side and dorsal views of brain of young alligator, c, cerebrum; cl, cerebellum; e, epiphysial str
. Comparative anatomy. Anatomy, Comparative. 490 COMPARATIVE ANATOMY wall, the dorsal half is the archicortex or primordium hippocampi. The medio-ventral wall forms the septum by which fibers pass to and from the hippocampus. The hemispheres are interconnected by anterior, anterior pallial and posterior pallial commissures located in the lamina terminalis. Habenular and posterior commissures persist in the roof of the dien- cephalon. The epiphysis forms a pineal gland. A chorioid plexus. Fig. 406.—Side and dorsal views of brain of young alligator, c, cerebrum; cl, cerebellum; e, epiphysial structures; h, hypophysis; i, infundibulum; ol, optic lobes; II-XII, cranial nerves. (From Kingsley's "Comparative Anatomy of Vertebrates," after Herrick.) invaginates into the third ventricle. The saccus vasculosus of fishes has disappeared. The thickened walls of the midbrain reduce the lumen to a narrow passage, the aqueduct. The cerebellum is rudimentary like that of cyclostomes. (Fig. 414) The ten cranial nerves of fishes persist in amphibia. Urodeles have lateralis nerves, but these disappear in the anura in correlation with the loss of lateral line organs. With the loss of gills, the number of branches of the vagus is reduced. Cervical and lumbar enlargements of the spinal cord appear in cor- relation with the enlargement of the 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 Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son
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