374 



NERVOUS SYSTEM. 



b. N. temporalis profundus. One or more large branches 

 passing mediad of the zygomatic arch to the temporal muscle. 



c. N. massetericus. The masseteric nerve passes dorso- 

 craniad to the masseter muscle. 



d. N. pterygoideus. One or more pterygoid branches 

 pass to the pterygoid muscles. A small twig from the nerve 

 to the internal pterygoid passes into the tympanic cavity and 

 supplies the tensor tympani muscle. 



e. N. buccinatorius (Fig. 154, e). This passes craniad 

 along the dorsolateral surface of the pterygoid muscles (Fig. 

 154, s) to the angle of the mouth. Here it divides into 

 branches to the masseter muscle, the mucosa of the mouth, 

 and to the lips. 



FIG. 154. DISSECTION SHOWING A NUMBER OF THE CRANIAL NERVES. 



The mandible and zygomatic arch have been cut and removed; the temporal and 

 internal pterygoid muscles are also removed, a, N. hypoglossus; b, N. lingualis; 

 . N. chorda tympani; e/, N. alveolaris inferior (cut); e. N. buccinatorius: f, Nn. 

 infraorbitales; g, N. sphenopalatinus; h, branch of N. oculomotorius ; z, N. zygo- 

 maticus;/, N. lachrymalis; k, N. abducens; /. N. trochlearis; /, N. frontalis; , N. 

 auriculotemporalis. i, cut end of zygomatic process of temporal; 2, tympanic bulla; 

 3, M. digastricus; 4, M. constrictor pharyngis medius; 5, M. hyoglossus; 6, M. 

 genioglossus ; 7, M. geniohyoideus; 8, M. pterygoideus externus (cut); 9, cut 

 cranial end of zygomatic arch; 10, mandible (cut); II, lachrymal gland. 



After giving off the above branches the mandibular nerve 

 passes three or four millimeters laterad along the root of the 

 zygomatic process of the temporal bone, and divides into two 

 large branches, the inferior alveolar (or dental) nerve (d] and 

 the lingual nerve (b}. 



