548 



CRANIAL NERYES. 



lies beneath, the Levator labii superioris muscle, and divides into a leash of 

 branches, which spread out upon the side of the nose, the lower eyelid, and upper 

 lip, joining with filaments of the facial nerve. 



The branches of this nerve may be divided into three groups : 1. Those given 

 off in the spheno-maxillary fossa. 2. Those in the infra-orbital canal. 3. Those 

 on the face. 



( Orbital. 



Spheno-maxillary fossa < Spheno-palatine. 

 ( Posterior dental. 



Infra-orbital canal 

 On the face 



Anterior dental. 

 ( Palpebral. 

 I Nasal. 

 { Labial. 



The Orbital branch arises in the spheno-maxillary fossa, enters the orbit by the 

 spheno-maxillary fissure, and divides at the back of that cavity into two branches, 

 temporal and malar. 



Fig. 280. Distribution of the Second and Third Divisions of the Fifth Nerve 

 and Submaxillary Ganglion. 



Aunculo -. 



The temporal branch runs in a groove along the outer wall of the orbit (in the 

 malar bone), receives a branch of communication from the lachrymal, and, passing 

 through a foramen in the malar bone, enters the temporal fossa. It ascends 

 between the bone and substance of the Temporal muscle, pierces this muscle and 

 the temporal fascia about an inch above the zygoma, and is distributed to the 

 integument covering the temple and side of the forehead, communicating with the 

 facial and auriculo-temporal branch of the inferior maxillary nerve. 



The malar branch passes along the external inferior angle of the orbit, emerges 



