. Diseases of the nervous system . dinalis medialis Fig. 47.—The nuclear origin of the oculomotor ami trochlear in the middle brain; their centraltract (blue) and their union with each other, as well as with the nucleus of the abducensthrough the median longitudinal bundle (red). The division of the nucleus of the oculo-motor in the lateral principal nucleus, the small-celled median nucleus, and the large-celledmedian nucleus; the localization of the different fiber groups of the oculomotor in thisnuclear area. The central course of the so-called pupillary fibers of the optic nerve (tractfor t
. Diseases of the nervous system . dinalis medialis Fig. 47.—The nuclear origin of the oculomotor ami trochlear in the middle brain; their centraltract (blue) and their union with each other, as well as with the nucleus of the abducensthrough the median longitudinal bundle (red). The division of the nucleus of the oculo-motor in the lateral principal nucleus, the small-celled median nucleus, and the large-celledmedian nucleus; the localization of the different fiber groups of the oculomotor in thisnuclear area. The central course of the so-called pupillary fibers of the optic nerve (tractfor the reflex contraction of the pupil). (Diagram based on Bernheimers description.) 53 54 HISTOLOGY OF THE CENTRAL NERVOUS SYSTEM mined, the reader being referred to the works of Edinger, Westphal, Pick andStarr. The united fibers (among these a few crossed ones also) pass trans-versely through the tegmentum of the cerebral peduncles, ventrally downward,and subsequently appear as a nerve upon the inner side at the base of the brain. Nucl. mot. n. V -—,Nucl. n. VI -Nucl. n. VII — Nucl. mot. n. IX et X .-- Nucl. n. II- Nucl. sens. n. V .-Nucl. n. vestib. (VIII) Nucl. n. XI -~Nucl. n. XII- Nucl. n. cochl. (VIII)- Nucl. sens. n. IX Nucl. sens. n. X Tract, solitarius etNucl. tract, solitarii Rad. ascend, n. V Fig. 48.—Nuclear Origin of the Cerebral Nerves. (After Toldt.) where the cerebral peduncles converge to an angle before disappearing belowthe pons. The nuclei of the trochlear nerve unite (Figs. 47-49) behind the nucleiof the oculomotor nerve at the height of the posterior part of the posteriorcorpora quadrigemina. The nerve processes of its cells now follow a peculiarcourse. For a short distance the}r run horizontally and caudally, then ver-tically (dorsaHy), and internally, until they reach the velum medullare anti-cum which, as is well known, covers the fourth ventricle anteriorly, while thelingula of the cerebellum extends beyond it. Here in the velum (Fig. 48) thefibe
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