NERVUS MAXILLARIS 



387 



fissure into the infra-temporal fossa, and, near the middle 

 of the inferior orbital fissure, enters the infra-orbital canal, 

 where it receives the name of infra-orbital. The infra - 

 orbital canal traverses the floor of the orbit, which, it should 

 be remembered, forms the roof of the maxillary sinus 

 also. Finally, the nerve emerges upon the face through 

 the infra-orbital foramen, and breaks up, under cover of the 

 quadratus labii superioris, into numerous branches which 

 form a dense plexus with twigs from the facial nerve. Its 



Zygomatic nerve 



Posterior superior alveolar 

 ! Infra-orbita 



Maxillary ne 

 Ophthalmic nerve 

 ningeal branch of maxillary nerve 

 Sensory root j 



Motor root of 

 trigeminal 



Semilunar ganglion -' 

 Mandibular nerve ' 



Zygomatico-temporal 

 Zygomatico-facial 

 \ Middle superior alveolar 

 Anterior superior 



Spheno-palatine ganglion '' 



Post, palatine 



Middle palatine 



Ant. palatine 



FIG. 152. Diagram of the Maxillary Nerve. 



terminal filaments are distributed to the lower eyelid, the 

 nose, and the upper lip. The course of the maxillary nerve 

 may be separated into five stages, in each of which branches 

 are given off. These are : 



1. Within the cranium, {Meningeal (p. 330). 



2. In the pterygo-pala- ( , 



tine fossa, . \ Spheno-palatine. 



3. In the infra-temporal /"Zygomatic (already described). 



fossa, . . . \ Posterior superior alveolar. 



4. In the infra-orbital /Middle superior alveolar. 



canal, . . . ^Anterior superior alveolar. 



( Palpebral, \ t 



5. In the face, . . -I Nasal, v already described, 



{ Labial, J 



