UPPER MAXILLARY NERVE. 105 



with which they communicate, the whole forming the infraorbital plexus 

 (p. 49). 



g. The branches for the side of the nose supply the muscular and tegu- 

 mentary structures. 



Fig. 24. 



2. Trunk of the nerve leaving the 



Gasserian ganglion. 



3. Spheno-palatine branches. 



4. Temporo-malar branch. 



5. Posterior dental nerves. 



6. Anterior dental. 



7. Facial branches. 



DIAGRAM OP THE UPPER MAXILLARY NERVE AND ITS BRANCHES. 



h. The branches for the upper lip are three or four in number, which 

 divide as they descend, and are distributed chiefly to the surfaces of the 

 lip, though they supply as well the muscles and the labial glands. 



The infraorbital artery is a branch of the internal maxillary (p. 94). 

 Taking the course of the nerve through the infraorbital canal, the vessel 

 appears in the face beneath the elevator muscle of the upper lip; and it 

 ends in branches, which are distributed, like those of the nerve, to the 

 parts between the eye and mouth. In the face its branches anastomose 

 with the facial and buccal arteries. In the canal in the maxilla the artery 

 furnishes branches to the orbit. 



Another branch, anterior dental, runs with the nerve of the same name, 

 and supplies the incisor and canine teeth : this gives offsets to the antrum 

 of the maxilla, and near the teeth it anastomoses with the posterior dental 

 artery. 



The vein, accompanying the artery, communicates in front with the 

 facial vein; and terminates behind in a plexus of veins (alveolar) corre- 

 sponding with the offsets of the internal maxilla artery in the spheno- 

 maxillary fossa. 



SECTION IX. 



DEEP VESSELS AND NERVES OF THE NECK. 



IN this Section are included the deepest styloid muscle, the internal 

 carotid and ascending pharyngeal arteries, and some cranial and sympa- 

 thetic nerves. 



Position. The position of the part is to remain as before, viz., the 

 neck is to be fixed over a small block. 



