306 



THE MUSCLES 



GROUP OF MUSCLES WHICH :\rOYE THE ELBOW-JOIXT 



Fasci.e of the Upper Arm 



Tlie deep fascia of the upper arm forms a strong tube, thicker upon the pos- 

 terior than the anterior aspect, enclosing all the muscles and most of the vessels and 

 nerves. Aljove, it is continuous on the outer side and front with tlie fascia covering 

 the deltoid and pectoralis major, and internally with the axillary fascia. In the 



Fig. 270. — SuPEKFiciAL View of the Front of the Upper Arm. 



Pectoralis minor 



Coraeo-brachialis 



Long head of triceps 



Inner head of triceps 



Brachialis anticus 



Semilunar fascia 



Tendons of insertion of pec- 

 toralis major and deltoid 



— Outer head of triceps 



Brachialis anticus 



Extensor carpi radialis 

 longior 



Brachi,o-radialis 



lower two-thirds of. the upper arm it is joined upon its deep aspect by two strong 

 l)rocesses: the rxterivil iitteriniisfiilur s('j)(iim, wliich arises from the external condylar 

 ridge and the outer border of the humerus; and the internal intermvscular septum, 

 which arises from the internal condylar ridge and the inner border of the humerus. 

 The tube formed by the deep fasc-ia is thus divided by the bone and these two septa 

 into two com})artments. In the front comj^artment are placed the Hexors of the 

 elliow-joint, and in the back comj)artment tlie great extensor muscle. 



