Muscles of the Head. 151 



205. Muscles of the Lower Jaw, from outside. 



Muscles of the Lips and Mouth (Fig. 203 and 204): 



M. depressor Idbii inferioris (Quadratus menti). Orig. : External oblique 

 line of the lower jaw. Insert. : Lower lip and integument of the chin. 



M. levator menti (Levator Idbii inferioris) ; runs from the incisive fossa 

 of the lower jaw down to the integument of the chin. 



MM. indsivi Cowperi; two upper and two lower, arise from the 

 alveolar processes of the incisor teeth (not illustrated). 



M. buccinator. Orig. : Alveolar processes of both maxillary bones and 

 Hamulus pterygoid. of the sphenoid bone. Insert. : Into the upper and lower 

 lips, the central fibres intersecting each other. 



M. orbicularis sen Sphincter oris ; elliptic muscle closing the lips, 

 formed by the muscles that converge to the mouth; besides, origins at 

 the cartilage of the Septum narium (M. depressor septi) and in the region 

 of the alveoli of the canine teeth (MM. indsivi Cowperi). 



5. Muscles of the Ear (Fig. 203): 



M. attolens auriculae, raises the ear 1 



> Epicranms temporalis. 

 M. attrahens auriculae, draws the ear forwards J 



MM. retrahentes auriculae, draw the ear backwards. 



