. Comparative anatomy. Anatomy, Comparative. 5o8 COMPARATIVE ANATOMY form a pathway for fibers to and from the cerebral cortex. From the posterior walls of the infundibulum are differentiated a tuber cinereum, and also paired mammillary bodies, which have fiber connexion with the olfactory organ. Fibers are also received from the cerebral cortex and sent to the thalami. (Fig. 420). OLFACTORY LOBE U=-J TELENCEPHALON DIENCEPHALON MESENCEPHALON METENCEPHALON MYELENCEPHALDN Fig. 425.—A diagram of the brain of a four-months fetus as seen in median longi- tudinal section. The figure shows the locati
. Comparative anatomy. Anatomy, Comparative. 5o8 COMPARATIVE ANATOMY form a pathway for fibers to and from the cerebral cortex. From the posterior walls of the infundibulum are differentiated a tuber cinereum, and also paired mammillary bodies, which have fiber connexion with the olfactory organ. Fibers are also received from the cerebral cortex and sent to the thalami. (Fig. 420). OLFACTORY LOBE U=-J TELENCEPHALON DIENCEPHALON MESENCEPHALON METENCEPHALON MYELENCEPHALDN Fig. 425.—A diagram of the brain of a four-months fetus as seen in median longi- tudinal section. The figure shows the location of the more important brain commissures. (Redrawn from Coming's "Human Embryology," after Burckhardt.) Brain Commissures. Commissures are fiber tracts which cross the median plane of the body and bring lateral halves of the nervous system into relation with one another. Some of those in the brain persist through- out the vertebrate series, and serve as important topographic landmarks to determine homologous regions. (Fig. 425) Commissures have not been demonstrated in Amphioxus. In the terminal lamina of the telencephalon of cyclostomes are two, a more ventral anterior and a more dorsal pallial. Both connect the olfactory lobes with the hippocampi of the opposite side. Two habenular ganglia in the roof of the diencephalon are connected by the habenular commis- sure. Fibers from the hemispheres and from the hypothalamus also are contained in this commissure. Another commissure in the roof of. 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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