MUSCLES AND FASCIA OF UPPER EXTREMITY 149 



from the origin, and one from the insertion for attach- 

 ment of the oblique muscular fibers. Some fibers 

 from the axillary border of the muscle are usually 

 inserted into the capsule, known as the subscapularis 



minor. 



The Muscles and Fasciae of the Arm 



The aponeurosis of the arm (deep fascia) is thin over 

 the biceps, strong over the triceps, and is attached to 

 the humerus, intermuscular septa. 



The Muscles of the Anterior Humeral Region. The 

 muscles of this region are: 



Biceps. Coracobrachialis. 



Brachialis anticus. 



Biceps. Its short or inner head arises with the cora- 

 cobrachialis from the tip of the coracoid process; the 

 long head, from the upper end of the glenoid cavity; 

 within the capsule by a tendon continuous on each 

 side with the glenoid ligament; these two heads form 

 a belly in the middle and lower part of the arm. The 

 tendon of insertion is slightly twisted and attached 

 to the back part of the tuberosity of the radius, sep- 

 arated from the forepart by a bursa. From the inner 

 side of the tendon a part branches off as an aponeurotic 

 band or semilunar fascia, and blends with the deep 

 fascia of the forearm stretched across the brachial 

 vessels and median nerve. 



Coracobrachialis. Origin, tip of the coracoid betw r een 

 the pectoralis minor and short head of the biceps; 

 insertion, inner border and inner surface of the humerus 

 near its middle, between the triceps and the brachialis 

 anticus. 



Brachialis anticus. Arises from the lower half of 

 the front of the humerus, nearly the whole of the 

 internal intermuscular septum, and upper part of the 

 external. It is adherent to the capsule of the elbow- 



