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Nervus mandibularis.—This large trunk, the third division (D) 

 of the fifth cranial nerve, takes its origin by a strong root from the 

 semilunar (or Gasserian) ganglion, and a smaller ventral root (portio 

 minor) from the medulla. This nerve now passes out through the 

 foramen ovale (oi?), and divides into several branches. 



Nervus auriculotemporalis. — The comparatively large auriculo- 

 temporal nerve {Ä. R.) arises immediately distad of the foramen ovale, 

 and passes dorsad, emerging at the caudal border of the masseter 

 muscle, where it divides into two main branches, the auricular and 

 the temporal nerves. 



Auricular branch. — This nerve (iV) passes dorsocaudad along 

 the cranial border of the cartilaginous auditory meatus, and is dis- 

 tributed to the integument of the small external ear. 



Temporal branch. — The larger of the two, the temporal branch 

 (TiV), extends cephalad and, approximately at the point where it crosses 

 the zygomatic arch (2;), it gives off a strong branch (F) to the protu- 

 berance (P). The temporal branch then continues ventrocephalad 

 almost to the angle of the mouth, where it is distributed to the buc- 

 cinator muscle (5). 



The distributions of the remaining branches of the mandibular 

 nerve are indicaded in Figure 5. 



Nervus massetericus. — The mandibular next gives off the mas- 

 seteric nerve (Jf), which extends dorsocraniad and ends in the mas- 

 seter muscle (8). 



Nervus buccinatorius (B). — This nerve passes cephalad along 

 the dorsolateral surface of the pterygoid muscles into the buccinator 

 muscle. 



Nervus lingualis (L). — After passing laterad approximately one- 

 half millimeter, the mandibular nerve separates into two divisions, 

 the lingual and the inferior alveolar. The former passes anteriorly 

 between the external and internal pterygoid muscles into the tongue. 



Nervus alveolaris inferior {A). — This nerve has been traced only 

 to the mandibular foramen. Shortly after its origin it gives off a 

 large branch, the mylohyoid (H) to the mylohoid (7) and the di- 

 gastric (6) muscles. 



Function of the Nerve Supplying the Protuberance. 

 The temporal branch of the auriculotemporal nerve lies imme- 

 diately beneath the superficial muscles of the face. When the skin 



