37 2 NER.YO US SYSTEM. 



ument in the region between the eye and the external ear 

 (Fig. 155, nt). It anastomoses with the zygomatic branch of 

 the seventh nerve (Fig. 155, Ji). 



b. N. zygomaticus (subcutaneus malae) (Fig. 154, z). 

 This arises with the preceding and follows it for some distance. 

 It passes through a foramen in the frontal process of the malar 

 bone and is distributed to the lower eyelid and adjacent 

 integument. 



c. Nn. infraorbitales (Fig. 154, /; Fig. 155, /). The 

 infraorbital nerves are two of nearly equal size. They pass 

 through the orbit ventrad of the eyeball to the infraorbital 

 canal. On their course each divides once or twice and each 

 divides again in the infraorbital foramen, so that about eight 

 branches emerge from the infraorbital foramen and diverge to 

 the integument and whiskers of the upper lip and to the side 

 and wing of the nose (Fig. 155, /). In the infraorbital canal, 

 and before reaching it, branches are given to the molar teeth, 

 and a branch continues in the bone to the canine, incisor, and 

 premolar teeth. 



d. N. sphenopalatinus (Fig. 154, g). The sphenopala- 

 tine nerve turns mediad from the infraorbitals, directing its 

 course toward the sphenopalatine foramen. Before reaching 

 this it gives off the greater palatine nerve (N. palatinus 

 major), which enters the posterior palatine canal and passes 

 to the hard palate. The sphenopalatine then usually divides 

 into two branches which pass along side by side to enter the 

 sphenopalatine ganglion. This is a large elongated triangular 

 ganglion lying on the dorsal surface of the external pterygoid 

 muscle, just laterad of the sphenopalatine foramen. 



The following nerves are connected with the sphenopala- 

 tine ganglion : 



a. N. palatinus minor. This leaves the craniolateral 

 angle of the ganglion and passes to the soft palate. 



b. N. nasalis posterior. The posterior nasal nerve enters 

 the nasal cavity by the sphenopalatine foramen and is dis- 

 tributed to the mucosa of the ventral and middle parts of the 

 nasal cavity. 



c. N. canalis pterygoidii (Vidian Nerve). This is a large 



