36 ARBOREAL MAN 



the coronoid process of the ulna (see Figs. 13 and 14). 

 Between these two heads of origin the median nerve 



P.R.T.d) 



- P.R.T.(2) 



S.B, 



P.R.T. 



P.Q. 



FIG. 13. PRONATOR MUSCLES OF MAN. 



P.R.T. (1), Site of origin of superficial head, and P.R.T. (2), of 

 the deep head of the pronator radii teres, the insertion of 

 which is at P.R.T. P.Q., Pronator quadratus. S.B., Supi- 

 nator brevis. 



passes into the forearm, thereby rendering the two 

 portions quite distinct. The deeper (ulnar) part is 



