MUSCLES OF MASTICATION 



221 



latter action is due to the fact that tlie origin is nearer to the median plane than the 

 insertion. 



Structure. — The muscle is almost entirely flesli>-, and the fibers are almost 



Fig. 176. — Submaxillary and Laryngeal Regions of Horse, after Removal of Skin and Panniculus. 

 c, Mastoido-humeralis; d, sterno-cephalicus; e, omo-hyoideus and sterno-hyoideus; h, buccinator; i, 

 depressor labii inferioris; m, masseter; v, stylo-maxillaris; w, mylo-hyoideus; 2, posterior, S, anterior, border 

 of external ear; 30', angle of jaw; Sff, submaxillary lymi)h-glands: ^7, external maxillary vein; ,J9, facial continua- 

 tion of 37; 40, parotid duct; 44, parotid gland; 4-5, prominence of chin; r, wing of atlas. (After Ellenberger- 

 Baum, Anat. fiir Kiinstler.) 



longitudinal in direction. Some of them are inserted into the edge of the inter- 

 articular meniscus. 



Relations.— ExternaWy, the temporo-maxillary articulation and the temporalis 

 muscle; internally, the internal pterygoid and tensor palati muscles. The internal 



