. Comparative anatomy. Anatomy, Comparative. 548 COMPARATIVE ANATOMY roof of the mouth. The pars nervosa of the pituitary is proliferated from its ventral extremity during the third month. Mesencephalon. The inesencephalon undergoes relatively little change during ontogenesis. As a result of thickening the lateral walls, the central cavity is reduced to a slender aqueduct which connects third metacoele ( ventricle tV) thin roof of myelcncephalon myelocoele / ventricle IV ) posterior commissure esodiencephalic fold (ventricle III ; foramen of Monro. (Sylvian aqueduct) Fig. 452.—Diagrams to show
. Comparative anatomy. Anatomy, Comparative. 548 COMPARATIVE ANATOMY roof of the mouth. The pars nervosa of the pituitary is proliferated from its ventral extremity during the third month. Mesencephalon. The inesencephalon undergoes relatively little change during ontogenesis. As a result of thickening the lateral walls, the central cavity is reduced to a slender aqueduct which connects third metacoele ( ventricle tV) thin roof of myelcncephalon myelocoele / ventricle IV ) posterior commissure esodiencephalic fold (ventricle III ; foramen of Monro. (Sylvian aqueduct) Fig. 452.—Diagrams to show the topography of the brain of a four-day chick. A, plan of sagittal section. The arbitrary boundaries between the various brain vesicles (according to Kupffer) are indicated by broken lines. B, dextral view of a brain which has been dissected free. C, schematic frontal section plan of brain. The flexures of the brain are supposed to have been straightened before the section was cut. (From Patten's "Embryology of the ;) and fourth ventricles. From the dorsal portion of the midbrain arise the corpora quadrigemina, which contain optic and auditory reflex centers. From the dorsal plate of the mesencephalon develop also the red nuclei, which receive fibers from the cerebellum and send fibers by the rubrospinal tract into the spinal cord. The motor nucleus of the oculomotor nerve develops in the basal plate. Posterior to it at the same level is the nucleus of the trochlear nerve which belongs originally, in elasmobranchs, with 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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