A text-book of physiology for medical students and physicians . Edinger-Westphal Mm ,0:-^k Principal nucleus Median nucleus. Nucleus of 4th nerve. Fig. 107.—Nuclei of origin of the third and fourth nerves.—(From Poirier 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 in
A text-book of physiology for medical students and physicians . Edinger-Westphal Mm ,0:-^k Principal nucleus Median nucleus. Nucleus of 4th nerve. Fig. 107.—Nuclei of origin of the third and fourth nerves.—(From Poirier 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 nucl
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