THE MUSCLES OF THE UPPER EXTREMITY. 



121 



insert itself into the entire under surface of the ole- 

 cranon process of the ulna. 



The triceps is the great extensor of the antibrachium, 

 and direct antao-onist of the hrachialis anticus and 

 biceps. Its scapula or long head also materially pro- 

 tects that part of the shoulder-joint over which it passes, 



tcruZ^yrv of ext:.irv&t. rtLciy.Zon^vor. 

 jfrona^T' long vis. 





Fig. 36. — Bones of the forearm and liaiid of a Raven ; palmar aspect, and slightly- 

 dislodged from their normal positions in order the better to show the 

 origins and insertions of muscles for which the drawing is designed. 

 Life-size, by the author, from a specimen in his own collection. 



and assists other muscles of that region in retaining the 

 humerus in its shallow socket. 



72. The hrachialis atiticus is a very well-defined and 

 neat little muscle in the Raven (Figs. 24, 29, and 37). It 

 arises almost entirely fleshy from a circumscribed area on 

 the inner side of the anconal aspect of the distal extremity 



