THE MUSCLES OF THE UPPER EXTREMITY. 



97 



insertion on the top of the ulnar tuberosity of the 

 corresponding Immerus. 



To a limited degree, the coraco-brachialis and teres 



FIG. 33. Superficial muscles of the upper extremity in the region of the shoulder 

 and dorsum of a Raven, s, scapula ; a, anterior slip of the latissimus 

 dorsi ; p, its posterior slip. The head of the coracoid can be seen where 

 the mesial extremities of the patagii muscles pass over it ; s.h., the 

 scapulo -humeral is muscle. The extensor metacarpi radialis longus 

 muscle is indicated by the letters e.m.r.l. Life-size, by the author, 

 from his own dissections. 



minor assist the pectorals in their action in the down- 

 ward stroke of the humerus, and so the wing, but they 

 also assist in keeping that bone in its shallow gienoid 

 cavity. 



H 



