106 



THE STRUCTURE OF MAN 



mastoid, or even as far as the posterior edge of the auricularis 

 posticus. It may even completely fuse with the latter, which 

 thus appears to arise from the protuherantia occipitalis, as seems 

 to be the case with many lower Mammals. 



The second and deeper layer of this cervical muscle, the 



m. orbit, aur. 



i. orb. oculi 



m. auric, sup. m - auric, occipit. 



m. helic. 



FIG. 69. FACIAL MUSCLES AXD NERVES OF THE Lemuroid propithecus. (After Huge.) 

 Superficial muscles with the branchings of the facial nerve (n.fc. ). 



sphincter colli, runs from the occipital region over the edge 

 of the jaw to the regio parotideo-masseterica, the lip and 

 adjacent parts. We shall consider later which of the human 

 facial muscles are derived from this, and which from the 

 platysma ; at present we need only deal with the vestiges, often 

 very slight, of this musculature which was probably incom- 

 parably more developed in the ancestors of Man. Those 

 mimetic muscles which are found partly near the ear and partly 



