. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. THE MYELENCEPHALON 391 ders of the neuroblasts of the ventral zone, and later, on the establish- ment of the olivary bodies, other fibers, descending from the cere- bellum, decussate in this region to pass to the olivary body of the opposite side. In the lower part of the medulla fibers from the neuroblasts of the nuclei gracilis and cuneatus, which seem to be. ol z* Fig. 235.—Transverse Section through the Medulla Oblongata of an Embryo of about Eight Weeks. av, Ascending root of the trigemi
. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. THE MYELENCEPHALON 391 ders of the neuroblasts of the ventral zone, and later, on the establish- ment of the olivary bodies, other fibers, descending from the cere- bellum, decussate in this region to pass to the olivary body of the opposite side. In the lower part of the medulla fibers from the neuroblasts of the nuclei gracilis and cuneatus, which seem to be. ol z* Fig. 235.—Transverse Section through the Medulla Oblongata of an Embryo of about Eight Weeks. av, Ascending root of the trigeminus;fr, reticular formation; ol, olivary body; sf, solitary fasciculus; tr, restiform body; XII, hypoglossal nerve.—(His.) developments from the mantle layer of the dorsal zone, also decussate in the substance of the floor-plate; these fibers, known as the arcuate fibers, pass in part to the cerebellum, associating themselves with fibers ascending from the spinal cord and with the olivary fibers to form a round bundle situated in the dorsal portion of the marginal velum and known as the restiform body (Fig. 235, tr). The principal differentiations of the zones of the myelencephalon may be stated in tabular form as follows: Roof-plate Posterior velum. (Nuclei of termination of sensory roots of cranial nerves. Nuclei gracilis and cuneatus. The olivary bodies. ( Nuclei of origin of the motor roots of cranial nerves. Ventral zones < _,, ... I I he reticular formation. Foor-plate The median 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 McMurrich, J. Playfair (James Playfair), 1859-1939. Philadelphia : P. Blakiston's son & co.
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