Diseases of the nervous system .. . sterior olive, but much further anteriorly,about half-way to the origin of the facial. Its nerve fibers follow a knee-shaped course similar to that of the facial, although they do not form a doubleknee, but merely pass dorsally and somewhat frontally to the region of the 58 HISTOLOGY OF THE CENTRAL NERVOUS SYSTEM sensory vagus nucleus, there bending and forming an angle to unite with thesensory main root which rises here. Together they pass outwardly and alittle downward through the region traversed by the nuclei of the fifth nerveand their fibers (ascending
Diseases of the nervous system .. . sterior olive, but much further anteriorly,about half-way to the origin of the facial. Its nerve fibers follow a knee-shaped course similar to that of the facial, although they do not form a doubleknee, but merely pass dorsally and somewhat frontally to the region of the 58 HISTOLOGY OF THE CENTRAL NERVOUS SYSTEM sensory vagus nucleus, there bending and forming an angle to unite with thesensory main root which rises here. Together they pass outwardly and alittle downward through the region traversed by the nuclei of the fifth nerveand their fibers (ascending trigeminal root), and emerge at the point wherethe main branch of the vagus also appears conjointly with the giosso-pharvn-geal nerve; namely, in a space formed by the junction of the posterior olivewith the remains of the lateral column and the restiform bodv (Figs. 4-3and 43). The spinal accessory (Figs. 48. 49 and 53) springs from lx=^hind the nucleusambiguus in the same plane of the transverse section of the medulla Fig. 52.—Section through the Medulla Obloxgata. (After Edinger.) In its lengthy course its cells are found distributed as low as the sixth cervicalvertebra. Its nucleus, therefore, has its frontal beginning at the pyramidaldecussation just where the latter end of the posterior olive is visible upontransverse section, but it extends caudally far above the pyramidal decussationinto the cervical cord (Fig. 49). The characteristic gray substance of thespinal cord is. for some time distinctly visible, yet the original cells of thespinal accessory are still perceptible. We find them in the upper cervicalcord, in those areas in which the lateral horns are more conspicuous than inthe caudaL cervical cord. Thence the fibers of the spinal accessory pass hori-zontally through the lateral column and outward. Still higher, at the heightof the lateral horns, where, by manifold constrictions and changes of the graysubstance, and especially by the pyramidal decus
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