The anatomy of the nervous system, from the standpoint of development and function . SYSTEM The fibers from the medial nucleus enter both right and left nerves. Somefrom the caudal portion of the dorsal division of the lateral nucleus cross themedian plane. The others remain uncrossed. After sweeping in broad curvesthrough the tegmentum and red nucleus the fibers emerge through the oculo-motor sulcus. All of the extrinsic muscles of the eye except the lateral rectusand superior oblique are supplied by the medial and lateral groups of cells justdescribed. t, Nucleus of Edinger-Westphal,.Nucleus
The anatomy of the nervous system, from the standpoint of development and function . SYSTEM The fibers from the medial nucleus enter both right and left nerves. Somefrom the caudal portion of the dorsal division of the lateral nucleus cross themedian plane. The others remain uncrossed. After sweeping in broad curvesthrough the tegmentum and red nucleus the fibers emerge through the oculo-motor sulcus. All of the extrinsic muscles of the eye except the lateral rectusand superior oblique are supplied by the medial and lateral groups of cells justdescribed. t, Nucleus of Edinger-Westphal,.Nucleus of oculomotor nerve) .—-Corpora quadrigcminaCerebral aqueductNucleus of trochlear nerveTrochlear nerve Anterior medullary velum ..-?Motor nucleus N. V_, - Nucleus of facial nerveFourth ventricleNucleus of abducens nerve Nuc. salivatorius superior Nuc. salivatorius inferior- Nucleus of hypoglossal nerve — Dorsal motor nucleus N. X^--Central canal — Nucleus ambiguus MesencephalonOculomotor nerve Pons- • Portio minor N. V- Facial nerve ?Abducens nerve-Medulla oblongata. Fig. 122.—Motor nuclei of the cranial nerves projected on a median sagittal section of thehuman brain stem. Circles indicate somatic efferent nuclei; small dots, general visceral efferentnuclei; large dots, special visceral efferent nuclei. As one might expect from the fact that the oculomotor nerve supplies several distinctmuscles, its nucleus seems to be made up of a number of more or less distinct groups of cells;but the efforts to locate subordinate nuclei have given rise to contradictory results. Themost significant work in this field has been done by Bernheimer (1904), who extirpated in-dividual eye muscles in monkeys and studied the resultant changes in the cells of the oculo-motor nuclei. According to him, the various muscles are supplied by the lateral nucleus inthe following order, beginning at the rostral end: levator palpebral superioris, rectus supe-rior, rectus medialis, obliquus inferior,
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