THE ARM. 



273 



Branches of the Brachial Artery. The branches of the brachial artery are 

 the profunda (superior), the superior ulnar collateral (inferior profunda), the nutrient, 

 muscular, and inferior ulnar collateral (anastomotica magna). 



Deltoid 



Biceps 



Supinators and extensors 



Pronators and flexors 



Internal bicipital furrow 



Triceps, long and inner heads 



Brachial artery 



Coracobrachialis muscle 

 FIG. 284. Surface anatomy of the arm. 



Not infrequently the brachial artery instead of dividing into the radial and ulnar 

 opposite the neck of the radius divides higher up. This is called a high division and 

 is seen most often in the upper third of the arm. The two vessels may follow the 



Musculocutaneous nerve 



Brachial artery 

 Coracobrachialis 

 Median nerve 



Latissimus dorsi 



Brachialis anticus 



Anastomotica magna artery 



Superior profunda artery 

 Musculospiral nerve 

 Inner head of triceps 

 Ulnar nerve 



Inferior profunda artery 



Basilic vein 



FIG. 285. Dissection of the arm, viewed from the inner side. 



usual course in the arm, or the radial may run under the biceps tendon, instead of 

 over it, and the ulnar may accompany the median nerve in front of the medial con- 

 dyle or the ulnar nerve behind it. 

 18 



