MANDIBrLAR DIVISION OF THE FIFTH NFIiVE 757 



The ANTERIOR PORTION of the inaiidihular division of tlie fiftli nerve suppHes 

 the temporal, inasseter, and external pterygoid mutscles, and gives off a sensory 

 hranch, the h)ng biiccid nerve; the latter is accompanied, in the first ])art of its 

 course, by a small strand of motor fi)>res which leaves it to end in the anterior j)art 

 of the temporal muscle. 



(1) Tli(! temporal nerves, usually two in innnlicr, pass Itetween the lK)ne and 

 the upper border of the external pterygoid muscle, and turn U])wards around the 

 infra-temporal crest of the s])henoid bone to end in the deep surfacu; of tlie tem])oral 

 nuiscle. The posterior of these two nerves may arise in common with the mas- 

 seteric nerve. 



(2) The masseteric nerve passes between the l)one and the external pterygoid 

 muscle external to the temporal nerves, and accom])anies the masseteric artery 

 through the sigmoid notch of the mandible to be distributed to the masseter. It 



Fig. 447. — Distkihution or the MANniBULAR Division oi- tiik TuKiK^iiN.u. 



Nerve. (Henle.) 



LONG BVCCAJ. 

 NEHVI-: 



SUB- 



MANDIBULAI! 



GANGLION 



MENTA L 



BRANCH 



ANTERIOR TKM- 

 I'ORAL NERVE 



_ AVRICI'LO-TElM- 

 I'ORAL NERVE 

 POSTERIOR TEM- 

 PORAL NERVE 



NERVE TO MAS- 

 SETER 



CHORDA TYM- 

 PANI 



MYLO-nVOIl) 



NERVE 

 LINGUAL 

 NER VE 



MANDIBULAR 

 OR INFERIOR 

 DENT A I. NER VE 



may be readily traced through the deeper fibres of tiie masseter nearly to tlie 

 anterior border of that muscle. As it emerges from under cover of the external 

 pterygoid it gives a twig to the t(*mporo-mandibular articulation. 



(;>) The nerve to the external pterygoid, after a course of about an eighth of 

 an iiuih, divides into twigs which enter the deep surface of the two heads of the 

 musck;. It is usually aclherent at its origin to the long buccal nerve. 



(4) The long buccal nerve ])asses between the two heads of tlie external ]»tery- 

 goid nuiscle, and then turns forwards and emerges from undercover of the temj)oral 

 and masseter muscles at the anterior border of the latter. It runs forwards and 

 communicates with the buccal branch of the facial, being in this situation covere<l 

 only by the integument and fascia, to which it gives branches; then it pierces the 

 buccinator muscle and ramifies in the mucous membrane lining the cheek, its. ter- 

 minal twigs reaching as far forwards as the angle of the mouth. As it emerges 



