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 protuberantia occipitalis, as seems 
to be the case with many lower Mammals. 
The second and deeper layer of this cervical muscle, the 
m. orbit. aur. 
Mm. aUri Mm, auric. occipit. 
m. orb. ocult ' urte, sup. , pit 
m. max. lab. 
\ 
\\ 
m. levator 
ao | i- m. helic. 
" m. depressorhelicis 
aN 
\ 
\ 
J ; SS 
F ns SSS = 
m. auriculo-labial. a 
J 
~ 
“\m. aur. lab. int. 
~ 
Fic. 69.—FacraL MuscLes AND NERVES OF THE Lemuroid propithecus. (After Ruge.) 
Superficial muscles with the branchings of the facial nerve (n./-. ). 
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 
