254 HISTORY OF THE HUMAN BODY 



Front 



Oct. 



Plat. 



FIG. 70. Mimetic muscles in Ateles (a South American monkey). 

 [After RUGE.] 



(A) Superficial layer. (B) Deep layer. 

 Front, frontalis; Au. sup, auricularis superior; O. p, orbicularis palpebrarum; Zyg, 

 zygomaticus; Nas, nasalis; A, I, s, auriculo-labialis superior; A. I. i., auriculo-labialis 

 inferior; Au. ant, auricularis anterior; Au. post, auricularis posterior; Antitr, anti- 

 tragicus; Plat, platysma myoides; Occ, occipitalis; Tri, triangularis; MX. lab, maxillo- 

 labialis; O. or, orbicularis oris; Bucc, buccinator. 



