. An analytical compendium of the various branches of medical science, for the use and examination of students. Anatomy; Physiology; Surgery; Obstetrics; Medicine; Materia Medica. CRANIAL NERVES. 161 1st. Olfactory.—Arises by three roots, which coalesce in the fis- sure of Sylvius. 2d. Optic.—Arises from the thalamus opticus and the tubercula quadrigemina. 3d. Motor Oculi.—Arises from the crus cerebri. •4th. Patheticiis.—Arises from the valve of the brain. 5th. Trifacial.—Arises from the medulla oblongata, but emerges from the pons Varolii. 6th. Motor Externus.—Arises from the corpus pyramidal
. An analytical compendium of the various branches of medical science, for the use and examination of students. Anatomy; Physiology; Surgery; Obstetrics; Medicine; Materia Medica. CRANIAL NERVES. 161 1st. Olfactory.—Arises by three roots, which coalesce in the fis- sure of Sylvius. 2d. Optic.—Arises from the thalamus opticus and the tubercula quadrigemina. 3d. Motor Oculi.—Arises from the crus cerebri. •4th. Patheticiis.—Arises from the valve of the brain. 5th. Trifacial.—Arises from the medulla oblongata, but emerges from the pons Varolii. 6th. Motor Externus.—Arises from the corpus pyramidale. 7th. Facial and Auditwy.—Arises from the corpus restiforme and calamus scriptorius. 8th. Fneuniogastric, glosso-pharyngeal, and spinal accessory.— Arises by filaments from the fissure between the corpora olivare and restiforme, and from the spinal cord opposite the fourth cervical vertebra. 9th. ^Arises in the fissure between the corpus py- ramidale and corpus olivare. The cranial nerves may be divided into three classes, according to their function, viz.:—Nerves of special sense, including the 1st, 2d, and the auditory branch of the 7th. Nerves of motion, including the 3d, 4th, 6th, facial branch of the 7th and 9th. Compound nerves, comprising the 8th and 5th. The distribution of the cranial nerves— 1st. Olfactory.—Forms a large soft bulb, which rests on the cribri- form plate, and sends filaments through its foramina to the Schneide- rian membrane. 2d. Optic.—Forms a chiasm with its fellow, and enters the globe' of the eye to join the retina. Is a flattened cord. 3d. Motor Oculi?—Passes through the walls of the cavernous sinus to escape at the sphenoi- dal foramen, and then is dis- tributed upon the muscles of the eyeball, with the exception of the superior oblique and external rectus. It sends a branch to join the ophthalmic ganglion, from which proceed the ciliary nerves,^ which sup- ply the iris. 4th. Pathetic. — Passing throug
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