Diseases of the nervous system .. . XIRad. cerebr. n. XI Rad. spin. n. XI Rad, ant. nn. spin. Rad. post. n. 49.—Nuclear Origin of the Cerebral Nerves. (After Edinger.) little outwardly) through the pontal fibers at the point where these run tothe cerebellum as its superior peduncles. Its nerve fibers are situated withinthis longitudinal fiber layer through which they pass to those of the sensorytrigeminal roots; thus we see at the base of the brain betAveen the pons andsuperior peduncles a common root emerging from the cerebellum. 56 HISTOLOGY OF THE CENTRAL NERVOUS SYSTEM Close to t
Diseases of the nervous system .. . XIRad. cerebr. n. XI Rad. spin. n. XI Rad, ant. nn. spin. Rad. post. n. 49.—Nuclear Origin of the Cerebral Nerves. (After Edinger.) little outwardly) through the pontal fibers at the point where these run tothe cerebellum as its superior peduncles. Its nerve fibers are situated withinthis longitudinal fiber layer through which they pass to those of the sensorytrigeminal roots; thus we see at the base of the brain betAveen the pons andsuperior peduncles a common root emerging from the cerebellum. 56 HISTOLOGY OF THE CENTRAL NERVOUS SYSTEM Close to the motor origin of the fifth nerve, and upon about the sameplane, but extending rather caudally than ventrally, is the lengthy origin ofthe facial nerve (Figs. 48, 49, 50). Its nerve-cells extend caudally to thatpoint upon the surface where the rhomboid fossa terminates. Here it isdivided by the sensory root of the trigeminal nerve, and posteriorly by thatof the pneumogastric nerve.^ Its nerve fibers run a peculiar course. They. Fig. 50. -Facial Origix and its Surroitndixgs ; Namely, Nucleus and Fibers of theAuditory Nerve. (After Edinger.) at first rise dorsally above the long series of nuclear origins until immediatelybelow the floor of the fourth ventricle. Here nearly all make a right-angledcurve to the front, and thus form a Imndle which passes for a short distanceanteriorly, then suddenly forms another angle, the crus of which again curvesventrally and somewhat outwardly, thence runs directly and without cross-ing to the base, where (after passing through the pyramidal tract) it appearsbehind the pons at that point where the posterior olive, the border of thepons, and the restiform body form a small triangular groove. Therefore,the facial nerve in its peculiar course forms a double bend. In the convexity of this knee, immediatelv under the floor of the fourth 1 I shall at present not discuss the other masses which force themselves betweenthe origin of the facial and tha
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