Organic and functional nervous diseases; a text-book of neurology . |- grain daily, thedose being increased slowly, or of the chloride of gold, or nitrate ofsilver, or of nitroglycerin. Recently hypodermic injections of normalsalt solution beneath the conjunctiva havfi been recommended. Theyhave not been useful in my cases. 636 TEE CMANIAL NE:rVES AND THEIH DISEASES. THE THIRD, FOURTH AND SIXTH NERVES: THE MOTOR NERVESOF THE EYEBALL. OPHTHALMOPLEGIA. The eyeball and eyelid are moved by numerous muscles supplied bythese three nerves, as follows : The third nerve supplies the ciliary muscle, sph
Organic and functional nervous diseases; a text-book of neurology . |- grain daily, thedose being increased slowly, or of the chloride of gold, or nitrate ofsilver, or of nitroglycerin. Recently hypodermic injections of normalsalt solution beneath the conjunctiva havfi been recommended. Theyhave not been useful in my cases. 636 TEE CMANIAL NE:rVES AND THEIH DISEASES. THE THIRD, FOURTH AND SIXTH NERVES: THE MOTOR NERVESOF THE EYEBALL. OPHTHALMOPLEGIA. The eyeball and eyelid are moved by numerous muscles supplied bythese three nerves, as follows : The third nerve supplies the ciliary muscle, sphincter iridis, levatorpalpebrse, superior rectus, internal rectus, inferior rectus, inferioroblique. The fourth nerve supplies the superior oblique. The sixth nerve supplies the external rectus. The branches of the cavernous plexus of sympathetic nerves sup-ply the dilator pupillse. These nerves arise from groups of cellslying upon the floor of the aqueduct of Sylvius and of the fourthventricle of the brain. (Fig. 267.) The groups are closely joined to Fig. Sagittal section through the cerebral axis, to show the nuclei of the ocular nerves in the floor ofthe aqueduct of Sylvius and the fourth ventricle, and the course of the nerves to their exit. Thevarious groups of cells from which the third nerve arises are seen. RN, red nucleus of tegmentum ;L, lemniscus (sensory tract) ; CC, motor tract in the crus cerebri seen to traverse the pons and enterthe anterior pyramid of the medulla. each other by association fibres, the longest of which, between thethird and sixth nerve nuclei, pass in the posterior longitudinalbundle. The location of the nuclei of the oculomotor nerves and the functionof each group of cells has been the subject of much discussion, andunanimity of view has not yet been reached, though the subject hasbeen approached from the side of comparative anatomy (Spitzka, Edin-ger), embryology (von Gudden, Edinger), physiological experimenta-tion (Hensen and Volchers
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