THE CRANIAL NERVES. 131 



illary division and motor root, by the foramen ovale. The Gasserian gan~ 



%lion?> is situated on the sensory root at the origin of its three divisions. 

 OPHTHALMIC DIVISION, 6 goes to the forehead, eyelids, lachrymal gland, con- 



junctiva, iris, ciliary ganglion, and the nose. Its branches are 



Frontal? Lachrymal Nasal. 11 



SUPERIOR MAXILLARY DIVISION,* goes to the temple, cheek, lower eyelid, 



nose, lip, upper teeth, and to Meckel's ganglion, thence to the palate. Its 



branches are the 



Orbital Posterior Dental. J alp< i bral - 



Infraorbital.\ Nasal. 

 Spheno-palatine. Anterior Dentals* (Labial. 



INFERIOR MAXILLARY DIVISION, 8 includes the motor branch, and is therefore 

 a nerve of common sensation, motion, and special sense (taste). Its motor 

 filaments go to the muscles of mastication ; its sensory to the auditory meatus, 

 to the otic and submaxillary ganglia, the anterior part of the tongue, the 

 cheek, teeth, and the lingualis muscle (sensation). Its branches are the 

 Masseteric. Auricula-temporal. K Gustatory.** r Mylo-hyoid. 2 



Deep Temporal (2). or Posterior Division, Inferior Dental. \ {JSji* 1 *' 

 Buccal. having 8 sub-branches. v Mental. 25 



Pterygoid. 



6th, Abducens, 10 motor of the eye, arises from the medulla oblongata, deeply 

 from the floor of the 4th ventricle ; exit by the sphenoidal fissure, to the ex- 

 ternal rectus muscle of the eye. 



7th, Facial, or Portio Dura, 11 motor of the face, ear, palate, and tongue, 

 arises from the groove between the olivary and restiform bodies of the 

 medulla, deeply from the floor of the 4th ventricle. Exit by internal audi- 

 tory meatus, through the aqueductus Fallopii, and stylo-mastoid foramen, to 

 the muscles of expression, the tongue, muscles of the ear and palate, etc. 

 It communicates with the carotid and meningeal plexuses, the spheno-palatine 

 (Meckel's) and the otic ganglia, the auditory, great auricular, pneumogastric, 

 glosso-pharyngeal, and 5th nerves. Its chief branches are the 



Great Petrcsal, to Meckel's ganglion. Digastric. Stylo-hyoid. 

 Small Petrosal, to the otic ganglion. / Temporal. 



External Petrosal, to the meningeal plexus. Temporo- facial. \ Malar. 

 Tympanic, to the muscles of the tympanum. (inf-orbital. 



Chorda, Tympani, to the tongue, etc. Cervico- facial. \ Suprtmaxil . 

 Posterior Auricular, to auricle and occiput. (infra-maxil. 



8th, Auditory, or Portio Mollis of the 7th, 11 nerve of hearing, arises 

 just external to the facial, deeply from the floor of the 4th ventricle ; exit by 

 the internal auditory meatus, to the internal ear. Its branches are two, the 

 Vestibular, to the vestibule. Cochlear, to the cochlea. 



[This nerve is fully described at page 225, infra.] 



