ANGIOLOGY 223 



The (interior circumflex humeral artery passes through the short 

 head of the biceps and gives off a branch to the biceps muscle, 

 supplying the insertional part of the breast muscles. 



BRANCHES or THE BRACHIALIS PROFUNDA 



The brachialis profunda artery (Fig. 68, No. 3) continues as the 

 posterior circumflex humeral artery. This artery supplies the mus- 

 cles of the posterior part of the humerus, the skin of the wing, and 

 the muscles of the brachial region. The trunk of the arteria brachii 

 profunda passes downward along the anconeus muscle, supplying 

 that muscle and giving off the collateral ulnar artery. On the ulnar 

 olecranon it anastomoses with the recurrent ulnar, thus establishing, 

 at this region, collateral circulation. The rest of the brachialis 

 sends branches to the biceps muscle and to the skin of the upper 

 arm, and finally gives off the arteria collateralis radialis, which 

 supplies the condylo-ulnaris. It then anastomoses with the end 

 branches of the recurrent radialis artery. 



The radial artery (Fig. 67, No. 4) passes downward on the outer 

 rim of the forearm. It continues down to the carpal region, where 

 it supplies the muscles and the skin of the carpal region it gives off 

 the recurrent radial, which passes on the middle finger and finally 

 anastomoses with the collateral radialis artery. 



The ulnar artery (Fig. 68, No. 6 and 9) passes downward on the 

 inner surface of the ulna to the carpal region where it gives off a 

 branch to the wing plexus and divides into two branches, the smaller 

 branch supplying the thumb (Fig. 68, No. 7). This branch passes 

 down the radial side of the middle finger to the last joint of the 

 second finger. The larger (Fig. 68, No. 8) lies between the second 

 and the third finger bones, and passes through a slit between these 

 two bones to the flexor side of the hand and extends to the last 

 finger- joint, supplying the structures in the region. The ulnar 

 artery gives off a small arterial twig to the papilla of each large wing 

 feather (Fig. 67, No. 6). 



The recurrent ulnar passes backward to the olecranon of the ulna 

 and supplies the muscles, the skin, the feathers, and other structures 

 of the region, and terminates in end collateral ulnar branches 

 (Fig. 67, No. 5). 



