Arteria brachialis. 



207 



The brachial artery. Art. 

 brachialis, extends from the lower 

 border of the teres major muscle 

 to about half an inch below the bend 

 of the elbow, where it divides into 

 the radial and ulnar. It lies in the 

 Sulcus bicipitalis interims, the median 

 nerve at its outer, the uluar nerve 

 at its inner side in the upper third 

 of the humerus; further down the 

 two Venae brachiales are in close con- 

 tact with it. At the bend of the elbow 

 it passes below the Lacertus fibrosus 

 of the tendon of the M. biceps. Besides 

 its muscular branches which 

 are given off from it at diiferent 

 parts of its course, its branches are : 



a) The p refund a or supe- 

 rior profunda, Art. profunda 

 brachii, passes between the internal 

 and long heads of the triceps, in 

 connection with the musculo-spiral 

 (radial) nerve, to the outer side of 

 the upper arm, supplies the M. tri- 

 ceps, then the humerus by means of 

 a nutrient artery, pierces the 

 external iutermuscular septum, and 

 descends to the elbow where it is 

 called Art. collateralis radialis. One 

 terminal branch anastomoses with the 

 recurrent branch of the radial, the 

 other with the Art. anastomotica magna. 



b) The inferior profunda, 

 also called Art. collateralis ulnaris 

 superior, arises about the middle of the 

 arm and descends in company with 

 the ulnar nerve; it supplies the 

 M. brachialis anticus and M. triceps and 

 anastomoses with the posterior recur- 

 rent branch of the ulnar. 



c) The Anastomotica magna or Art. 

 collateralis ulnaris inferior, passes to- 

 wards the internal condyle, supplies 

 the superficial muscles arising from 

 it, and anastomoses with the anterior 

 recurrent branch of the ulnar, and, 

 after passing behind the humerus, 

 with the superior profunda artery. 



551. Course and Ramifi- 

 cation of the Brachial 

 Artery. 



