312 HUMAN ANATOMY. 



Superior maxillary nerve, entirely sensory also; supplies 

 sensation to upper jaw, teeth, hard and soft palates, tonsils, 

 gums, antrum of Highmore, muscles, skin and mucous membrane 

 of lower eyelid, muscles and skin of cheeks and upper lip, and 

 mucous membrane of floor of nares. 



Its branches are : 



Orbital, Middle dental, Palpebral, 



Spheno-palatine, Anterior dental, Nasal, 



Posterior dental, Labial. 



Inferior maxillary nerve consists of two portions : anterior, 

 or motor, and posterior, or sensory, having a threefold function, 

 because one of its branches, the lingual, is joined by the chorda 

 tympani nerve (given off from the facial nerve), which conveys 

 gustatory fibres to the anterior two-thirds of the tongue. It 

 supplies motion to all the muscles of mastication (except to 

 buccinator), anterior belly of digastric, and mylo-hyoideus ; sen- 

 sation to skin of ear, lower part of face, lower lip, and tongue. 

 Its branches are : 



Anterior Portion. Posterior Portion. 



Masseteric, Auriculo-temporal, 



Deep temporal (2), Inferior dental, 



Buccal, Lingual. 



Pterygoid (2). 



The fifth nerve has four ganglia connected with it : 



(a) Ophthalmic, or lenticular ; 

 (~b) Spheno-palatine, or MeckePs; 



(c) Otic, or Arnold's; 



(d) Submaxillary (ride Sympathetic System). 



6. ABDUCENS, motor; superficial origin, pyramidal body and 

 pons Varolii; deep origin,, floor of fourth ventricle; course, 

 passes forward in cavernous sinus; exit, sphenoidal fissure; dis- 

 tribution, to external rectus muscle. 



7. FACIAL, motor nerve; superficial origin, lateral tract of 

 medulla and pons Varolii; deep origin, from a nucleus in the 

 pons, deeply placed, from which the fibres ascend close to the 

 floor of the fourth ventricle, where they form the eminentia teres 

 arch over the nucleus of the sixth nerve, and then emerge (this 

 nerve carries some sensory fibres, probably gustatory fibres from 

 the tongue, through the chorda tympani nerve to the pass inter- 

 media, near the nucleus of the ninth nerve) ; course, forward and 

 outward, through internal auditory me'atus, aquaeductus Fallopii, 



