DISSECTION OF THE HEAD AND NECK 261 



lateralward and downward and find the artery (A. masseterica) 

 and nerve (N. massetericus, V. 3) passing through the incisura 

 mandibulae (0. T. sigmoid notch) to it. Cut through these 

 after they have been cleaned and studied, but do not detach the 

 M. masseter from its insertion. 



Temporal Muscle. 



The temporal muscle (M. temporalis) may now be examined. 

 How are the fibres arranged ! Saw nearly through the coronoid 

 process of the mandible, making the cut pass obliquely from the 

 middle of the incisura mandibulae downward and forward to the 

 junction of the ramus with the basis mandibulae. Complete the 

 division with fine forceps. Avoid injury to the N. buccinatorius. 

 Reflect the processus coronoideus with the attached M. tempo- 

 ralis upward and separate the muscle from the bone. Study the 

 anterior and posterior deep temporal nerves (N. temporalis 

 profundus anterior posterior] and arteries (A. temporalis 

 prof undo, anterior posterior) ; follow the distribution of the 

 A. temporalis media; find the point of exit of the ramus zygo- 

 maticotemporalis N. zygomatici (0. T. temporal branch of tem- 

 poromalar). 



Pterygoid Region. 



Make a cut through the neck of the condyloid process of the 

 mandible and another transversely through the ramus man- 

 dibulae just above the level of the mandibular foramen (O. T. 

 inferior dental foramen). Begin the cuts with the saw and 

 complete with bone-forceps. Eemove the incised portion of the 

 ramus and dissect away the fat and areolar tissue, so as com- 

 pletely to expose the pterygoid muscles and the pterygoman- 

 dibular raphe (raphe pterygomandibularis) of the fascia bucco- 

 pharyngea. 



Examine carefully the following structures : 



Muscles. (Spalteholz, Figs. 294 and 295.) 



(a) External pterygoid (M. pterygoideus externus). 



(b) Internal pterygoid (M. pterygoideus internus). 



(c) Buccinator muscle (M. buccinator). 



(ca) Buccopharyngeal fascia (fascia buccopharyngea) with its 



raphe pterygomandibularis. 

 Arteries. (Vide Spalteholz', Fig. 439.) 



(a) Internal maxillary (.4. maxillaris rntrrna). 

 First portion. 



(an) Deep auricular (.1. auricularis profunda}. 

 (ab) Anterior tympanic (A. tympanica anterior). 



