A text-book of physiology for medical students and physicians . irier and Charpy.) tral gray matter of the midbrain at the level of the superior col-liculus. The fibers for the ciliary muscle and sphincter pupilla*arise more anteriorly than those for the extrinsic muscles. His-tologically three parts at least may be distinguished, as shown inFig. 107,—namely, the lateral (or principal) nucleus, which givesorigin chiefly to the fibers innervating the extrinsic muscles; themedian nucleus; and the nucleus of Edinger-Westphal. Accordingto Bernheimer* the large median nucleus gives rise to the fibe
A text-book of physiology for medical students and physicians . irier and Charpy.) tral gray matter of the midbrain at the level of the superior col-liculus. The fibers for the ciliary muscle and sphincter pupilla*arise more anteriorly than those for the extrinsic muscles. His-tologically three parts at least may be distinguished, as shown inFig. 107,—namely, the lateral (or principal) nucleus, which givesorigin chiefly to the fibers innervating the extrinsic muscles; themedian nucleus; and the nucleus of Edinger-Westphal. Accordingto Bernheimer* the large median nucleus gives rise to the fibersthat innervate the ciliary muscles, while the Edinger-Westphalnuclei (accessory nuclei) control the movements of the sphinctermuscle of the iris. Some of the fibers, particularly those from * Bernheimer, in Graefe-Saemischs Handbuch der ges. Augenheilkunde,2ded., I, 41. CEREBELLUM, PONS, AND MEDULLA. 245 the lateral nucleus to the inferior rectus, the internal rectus, andthe inferior oblique, cross the mid-line and emerge in the nerveof the opposite Fig. 108. —Diagram showing the average area of distribution of the sensory fibers of thetrigeminal nerve.—(Cushing.) N. opht
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