284 A MANUAL OF ANATOMY, 



about the wrist by means of thickened portions called an- 

 nular ligaments. 



At the elbow the fascia is united to all the bony points. 

 Behind, to the olecranon, and here it receives the fibrous 

 expansion of the tendon of the triceps muscle. At the 

 sides, to the humeral condyles, and by means of the inter- 

 muscular septa to the condyloid ridges. In front, it receives 

 the fascial prolongation of the bicipital tendon, and is pierced 

 for the deep median vein. 



The intermuscular septa in the arm separate the anterior 

 from the posterior muscles. In the anterior compartment 

 are the biceps, coracobrachialis, brachialis anticus, origin 

 of the supinator longus, and the extensor carpi radialis 

 longior. In the posterior is the triceps muscle. 



In the forearm the intermuscular septa are especially 

 well-marked and appear as " white lines," indicating the 

 separations between the various muscles and forming 

 guides to the arteries. 



DISSECTION. 



Remove the superficial veins and the deep fascia to just below the elbow. 

 Leave the insertion of the biceps into the deep fascia. 

 Complete the dissection of the parts exposed. 



Coracobrachialis. Fig. 62. 



Origin From the tip of the coracoid process of the 

 scapula with the short head of the biceps. 



Insertion. Into the middle third of the inner border of 

 the humerus for a distance of two inches. 



Nerve Supply. By the musculocutaneous, which usually 

 passes through the muscle. The nerve filaments come 

 from the seventh cervical nerve. 



Action. It is an adductor and flexor of the arm ; helps 

 to hold the humerus against the scapula. 



