TRIFACIAL NERVE. 



567 



molar and bicuspid teeth, the mucous membrane of the corresponding alve- 

 olar processes and to the antrum. 



In the infraorbital canal, a large branch, the anterior dental, is given off 

 to the teeth and mucous membrane of the alveolar processes not supplied 

 by the posterior den- 

 tal branches. This 

 branch anastomoses 

 with the posterior 

 dental. 



The terminal 

 branches upon the 

 face are distributed 

 to the lower eye- 

 lid (the palpebral 

 branches), to the 

 side of the nose 

 (the nasal branch- 

 es), anastomosing 

 with the nasal 

 branch of the oph- 

 thalmic, and to the 

 integument and the 

 mucous membrane 

 of the upper lip (the 

 labial branches). 



The inferior 

 maxillary is a mixed 

 nerve, composed of 

 the inferior division 

 of the large root 

 and the entire small 

 root. The distribu- 

 tion of the motor 

 filaments has al- 

 ready been described. This nerve passes out of the cranial cavity by the for- 

 amen ovale, and then separates into the anterior division, containing nearly 

 all of the motor filaments, and the posterior division, which is chiefly sensory. 

 The sensory portion breaks up into the following branches : 



1. The auriculo-temporal nerve supplies the integument in the temporal 

 region, the auditory meatus, the integument of the ear, the temporo-maxillary 

 articulation and the parotid gland. It also sends branches of communica- 

 tion to the facial. 



2. The lingual branch is distributed to the mucous membrane of the 

 tongue as far as the point, the mucous membrane of the mouth, the gums, 

 and to the sublingual gland. This nerve receives a branch from the facial 

 (the chorda tympani) which has already been described. From this nerve, 



FIG. 212. Inferior maxillary division of the fifth (Hirschfeld). 

 1, branch from the motor root to the masseter muscle ; 2, filaments from 

 this branch to the temporal muscle ; 3, buccal branch ; 5, 6, 7, branches 

 to the muscles ; 8, auriculo-temporal nerve ; 9, temporal branches ; 10, 

 auricular branches; 11, anastomosis with the facial nerve ; 12, lingual 

 branch; 13, branch of the motor root to the mylo-hyoid muscle ; 14, 15, 

 15, inferior dental nerve, with its branches ; 16, mental branch ; 17, 

 anastomosis of this branch with the facial nerve. 



