Muscles of the NecTf. 



251 



M. quadratus 

 labii inferioris^- 



a. truuigiihiris 



yi. transversu 

 iiienti 



297. Right platysma, viewed from in front. 



Platysma (see also Fij^s. 286 and 291). Form: ol)lorig-(|uacli-angular, thin, very large. 

 Position: just beneath the skin in the clavicular region, in the neck and in the lower part of 

 the face. Origin: fasciajiecliii'alis. Insertion: the fibers run parallel, medianward and upward : 

 the posterior fibers radiate out upon the fascia parotideomasseterica , the anterior go partly ti) 

 the angle of the mouth, partly into the m. quadratus labii inferioris, partly to the basis 

 mandibulae. Below the chJ^_tho fibers of the two sides often decussate. Action: it liits the 

 skin of the neck""from the subjacent tissue; it draws the angle of the mouth to the side and 

 downward. Innervation: ramus colli n. facialis. 



