MUSCLES OF THE LIPS AXD MOUTH. 



Fig. 156. 



177 



Fig. 156. DEEP VIEW OP THE MUSCLES OP THE LEFT SIDE OP THE HEAD AND NECK 

 (modified from Bourgei-y). g 



a, vertex of the head ; b, superior curved line of the occipital bone ; c, ramus of the 

 lower jaw; </, its coronoid process ; d, body of the hyoid bone ; e, sternal end of the clavicle; 

 e', acromial end ; /, malar bone divided to show the insertion of the temporal muscle ; 

 /', zygoma divided, and external lateral ligament of the jaw ; g, thyroid cartilage ; h, placed 

 on the lobe of the auricle, points to the styloid process ; 1, temporal muscle ; 2, corrugator 

 supercilii ; 3, pyramidalis nasi ; 4, lateral cartilage of the nose covered by the triangularis 

 nasi ; 5, levator labii superioris proprius ; 6, levator anguli oris ; 7, outer part of the 

 orbicularis oris, the part below the nose has been removed to show more deeply ; 8, de- 

 pressor alse nasi ; 9, placed on the ramus of the jaw, points to the buccinator muscle, 

 through which the parotid duct is seen passing ; 10, quadratus menti; 11, levator menti ; 

 12, 12, anterior and posterior bellies of the digastric ; 13, placed on the angle of the jaw, 

 points to the stylo-hyoid muscle; 14, points to the mylo-hyoid; 15, to the hyo-glossus, 

 between which and 13, is seen a part of the stylo-glossus ; 16, sterno-hyoid ; 17, on the 

 clavicle, indicates the lower, and 17', the upper belly of 'the omo-hyoid ; 18, a small part 

 of the sterno-thyroid ; 19, thyro-hyoid ; 20, 21, on the sterno-mastoid muscle, point, the 

 first to the middle, the second to the lower constrictor of the pharynx ; 22, trapezius ; 

 23, upper part of the coraplexus ; 24, splenius capitis ; 25, splenius colli ; 26, levator 

 scapulae ; 27, middle scalenus ; + , posterior scalenus ; 28, anterior scalenus. 



N 



