Chap. VII] 



MUSCULAR TISSUE 



111 



by the pectoralis major and latissimus dorsi, which have been 

 described. 



Biceps. — The biceps is a long fusiform muscle, occupying the 

 whole of the anterior surface of the arm ; it is divided above 

 into two portions or heads, from which circumstance it has re- 



FiG. 80. — Muscles of the 

 Front op the Right Shoulder 

 AND Arm. (Gerrish.) 



Fig. 81. — Muscles on the Dorsum of the 

 Right Shoulder and Arm. CGerrish.) 



ceived its name. It arises by these two heads from the scapula, 

 and is inserted into the radius. 



Action. — It flexes the forearm on the arm. 



Triceps. — The triceps is situated on the back of the arm, 

 extending the whole length of the posterior surface of the humerus. 

 It is of large size, and divided above into three heads ; hence its 

 name. Two of the heads have their origin in the scapula and one 

 in the humerus. The three heads unite in a common tendon 

 which is inserted into the ulna. 



