. Chordate anatomy. Chordata; Anatomy, Comparative. THE NERVOUS SYSTEM 359 terminalis. Habenular and posterior commissures persist in the roof of the diencephalon. The epiphysis forms a pineal gland. A chorioid plexus invaginates into the third ventricle. The saccus vasculosus of fishes has disappeared. The thickened walls of the mid-brain reduce the lumen to a narrow passage, the aqueduct. The cerebellum is rudimentary like that of Fig. 318.—Side and dorsal views of brain of young alligator, c, cerebrum; cl, cerebellum; e, epiphysial structures; /;, hypophysis; i, infundibulum;
. Chordate anatomy. Chordata; Anatomy, Comparative. THE NERVOUS SYSTEM 359 terminalis. Habenular and posterior commissures persist in the roof of the diencephalon. The epiphysis forms a pineal gland. A chorioid plexus invaginates into the third ventricle. The saccus vasculosus of fishes has disappeared. The thickened walls of the mid-brain reduce the lumen to a narrow passage, the aqueduct. The cerebellum is rudimentary like that of Fig. 318.—Side and dorsal views of brain of young alligator, c, cerebrum; cl, cerebellum; e, epiphysial structures; /;, hypophysis; i, infundibulum; ol, optic lobes; II-XII, cranial nerves. (From Kingsley's "Comparative Anatomy of Vertebrates," after Herrick.) 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 appendages. 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. 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 & Co.
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Keywords: ., bookcentury1900, bookpublisherphi, booksubjectanatomycomparative
