THE MUSCLES OF THE FORE-LIMB 



37 



variable in the degree of its development in Man; at 

 times it constitutes but a small portion of the whole 

 muscle, and occasionally it is entirely absent. In all 



-P.R.T. 



Fig. 14. — The Insertion of the Bicipital Pronator Radii 



Teres of Man (P.R.T.). 



S.B., Supinator brevis. 



the Anthropoids this variability of the ulnar part is 

 displayed, with an increasing tendency to vary in tlie 

 direction of partial or complete absence. 



In the Orang-utan the condition is practically identical 

 with that seen in Man. In the Chimpanzee, Hepburn 



