THE ANTERIOR HUMERAL REGION 



469 



the elbow the deep fascia is attached to all the prominent points around the joint 

 viz., the condyles of the humerus and the olecranon process of the ulna and is 

 continuous with the deep fascia of the forearm. Just below the middle of the 

 arm, on its inner side, in front of the intermuscular septum, is an oval opening 

 in the deep fascia which transmits the basilic vein and some lymphatic vessels. 



FIG. 353. Horizontal section at middle of right arm upper surface of lower segment. B. V., basilic vein. 

 CEPH. V., cephalic vein. I. C. N., internal cutaneous nerve. I. P. A., inferior profunda artery. M. C. N., mus- 

 culocutaneous nerve. M. N., median nerve. M. S. N., musculospiral nerve. S. P. A., superior profunda artery. 

 U. N., ulnar nerve. (After Braune.) 



The Coracobrachialis (ra. coracobrachialis), the smallest of the three muscles 

 in this region, is situated at the upper and inner part of the arm. It arises by 

 fleshy fibres from the apex of the coracoid process, in common with the short head 

 of the Biceps, and from the intermuscular septum between the two muscles; the 

 fibres pass downward, backward, and a little outward, to be inserted by means of 

 a flat tendon into an impression at the middle of the inner surface and internal 

 border of the shaft of the humerus between the origins of the Triceps and Brachi- 

 alis anticus. It is perforated by the musculocutaneous nerve. The inner border 

 of the muscle forms a guide to the position of the terminal portion of the axillary 

 and upper part of the brachial arteries. 



Relations. By its superficial surface, with the Pectoralis major above, and at its insertion 

 with the brachial vessels and median nerve which cross it; by its deep surface, with the tendons 

 of the Subscapularis, Latissimus dorsi, and Teres major, the inner head of the Triceps, the 



