ANTERIOR ASPECT OF HEAD AND NECK. 



communicate, on the face, with temporal branches of the 

 facial. The supra-orbital emerges at the supra-orbital foramen 

 and ascends to the forehead; it supplies the frontal sinus, 

 upper eyelid, and the forehead and scalp as far back as the ver- 

 tex; it communicates with temporal branches of the facial. 

 The supra-trochlear emerges under the inner side of the supra- 

 orbital arch and supplies the skin of the mesial part of the 

 forehead, the root of the nose, and the inner canthus of the 

 eye. The nasal enters the nasal cavity through the nasal fis- 

 sure and divides; the internal branch supplies the mucous 

 membrane on the upper and fore part of the septum; the ex- 

 ternal branch supplies the outer wall and then runs between 

 the nasal bone and lateral cartilage to supply the skin on the 

 lower part and tip of the nose, communicating with the infra- 

 orbital. The infra-trochlear branch of the nasal emerges at the 

 inner angle of the orbit and supplies the eyelids and skin on 

 the root of the nose, communicating with the infra-orbital 

 branches of the facial. [679] 



Superior Maxillary. Emerging from the foramen rotun- 

 dum, this runs across the spheno-maxillary fossa and through 

 the spheno-maxillary fissure, entering the orbit as the infra- 

 orbital nerve ; it then continues through the infra-orbital canal 

 and foramen to the face. [681] 



Branches in the Spheno-maxillary Fossa. The spheno-pala- 

 tine are the two short roots of Meckel's ganglion. The posterior 

 dental descends in the pterygo-maxillary fissure and runs for- 

 ward along the outer side of the upper alveolar arch to the 

 gums and molars, piercing the bone. The orbital runs through 

 the spheno-maxillary fissure and along the outer wall of the 

 orbit, communicating with the lachrymal. Then passing 

 through the orbital canal of the malar it divides into two 

 branches: the malar branch supplies the skin over the malar; 

 the temporal branch supplies the front of the temple; both 

 communicate with the facial. [681] 



Branches in the Infra-orbital Canal. The middle and anterior 



[69] 



