2 68 



APPLIED ANATOMY. 



THE EXTERNAL, OR ABDUCTOR SET. 



This comprises only one muscle, the deltoid; the supraspinatus belongs to the 

 shoulder region. 



The deltoid forms the large rounded prominence of the shoulder. At its 

 insertion the bone is nearest the surface and can be most readily felt. The posterior 

 edge can be plainly seen when contracted running upward and inward and crossing 



Acromion process 



Coracoid process 



Deltoid 



Long head of biceps 



Short head of biceps 



Pectoralis major 

 



Biceps (cut edge)' 



Brachialis anticus 



Outer condyle 

 Capitellum 



Insertion of 

 biceps tendon 



Radius 



ubscapularis 



Teres major 

 Latissimus dorsi 



Inner condyle 



Coronoid process of ulna 



FIG. 280. Anterior view of muscles of the arm. 



the posterior fold of the axilla at right angles. Its anterior edge blends more or 

 less completely with the pectoralis major (Fig. 279). 



THE INTERNAL SET. 



The internal set includes the coracobrachialis, with the short head of the biceps, 

 and the pectoralis major, teres major, and latissimus dorsi. 



