Muscles of the Head. 



247 



M. temporalis 



Tuberculuni articulare 



Os zygomaticum (sawed througli) 



Ductus parotideus 

 (cut through) 



M. bucciuator 



293. 



IVI. buccinator 

 and m. temporalis, 



viewed from the riglit side. 



]\I. incibivus labii sinjerioi is 



Mm. zygomaticus, caninus, triangularis 

 (cut through) 



M. inq^ivus 

 labii inferioris 



(The arcus zygomaticus has been sawed away at its origins, the joint of the lower jaw having 



been opened at the same time.) 



M. temporalis. Form: flat, triangular, broad and thin above, narrow and thick behiw. 

 Position: covered by the fascia temporalis and the arcus zygomaticus; it fills up the fossa 

 temporalis completely. Origin: the Avhole extent of the fossa temporalis and medial surface 

 of the fascia temporalis Insertion: the anterior fibres run vertically, the posterior almost 

 horizontally and markedly curved: all the fibres converge to the processus corunoideus mandibulae 

 and descend deep to its medial surface. The tendon reaches in a jagged form as far as 

 half the height of the muscle on its lateral surface. Action: lifts the lower jaw and draws 

 it somewhat backward. Innervation: nn. temporales profundi (Y. 3). 



Fascia buccopharyiigea, very thin, covers the lateral surface of the m. buccinator; 

 it becomes lost in front at the angle of the mouth, is stretched out as a denser cord between 

 the hamulus pterygoideus and the posterior end of the crista buccinatoria [mandibulae] as the 

 raphe pteryr/omandibularis (see Fig. 294) and goes over behind ujjon the outer surface of the 

 nmscles of the throat. 



