296 A MANUAL OF ANATOMY. 



radialis, palmaris longus, flexor sublimis digitorum, for 

 the upper half. In the lower half, and for the entire 

 course, by the skin and fasciae. 



Internally : The flexor carpi ulnaris. The ulnar nerve is 

 close to the ulnar side of the artery for the lower two- 

 thirds of its course in the forearm. 



Outside : The tendons of the flexor sublimis digitorum 

 for the lower two-thirds. Behind : Brachialis anticus, 

 flexor profundus digitorum. 



Branches of the Ulnar Artery. 



(1) Recurrent: (a) The anterior. Usually a branch 

 from the posterior recurrent may arise from the ulnar just 

 after its origin. It ascends behind the pronator radii 

 teres to anastomose upon the brachialis anticus with the 

 anterior branch of the anastomotica magna and the in- 

 ferior profunda. (&) The posterior recurrent. A larger 

 artery than the anterior (which is usually derived from 

 it) from the inner side of the ulnar. It runs upward upon 

 the flexor profundus digitorum to behind the internal 

 condyle, and between the two heads of the flexor carpi 

 ulnaris muscle, and terminates by an anastomosis with the 

 inferior profunda, posterior branch of the anastomotica 

 magna, and interosseous recurrent. Behind the internal 

 condyle it is close to the ulnar nerve. 



(2) Common interosseous : This is a large branch from 

 the outer part of the ulnar, about half an inch long, which 

 passes backward and divides into the anterior and posterior 

 interosseous arteries, (a) The anterior interosseous con- 

 tinues the direction of the main trunk down the front of the 

 interosseous membrane, between the flexor longus pollicis 

 and flexor profundus digitorum, to the upper margin of the 

 pronator quadratus muscle, behind which it disappears. 



