THE FOREARM. 



pulse from the ulnar artery to be less distinctly felt than that from the radial. When 

 the artery passes beneath the pronator radii teres muscle it is crossed by the median 

 nerve, which lies superficial to the artery, and is separated from it by the deep head 

 of the muscle. The branches of the ulnar artery in the forearm are the anterior and 

 posterior ulnar recurrents, the common interosseous, muscular, nutrient, and anterior 

 and posterior ulnar carpal branches (Fig. 329). 



The anterior ulnar recurrent runs upward between the edges of the pronator 

 radii teres and brachialis anticus. 



Radial recurrent 



Radial artery 

 Interosseous recurrent 

 Posterior interosseous 



Brachioradialis muscle 



Flexor carpi radialis muscle 



Median nerve 

 Superficial volar 



Brachial artery 



Anterior ulnar recurrent 

 Posterior ulnar recurrent 

 Ulnar artery 

 Common interosseous 



Anterior interosseous 



Flexor carpi ulnaris muscle 



Palmaris longus tendon 



Anterior carpal branch of the ulnar 



FIG. 329. Arteries of the forearm. 



The posterior ulnar recurrent passes upward with the ulnar nerve behind the 

 medial (internal) condyle. 



The common interosseous artery comes off from the ulnar about 2 to 3 cm. from its 

 origin and divides into the volar (anterior) and dorsal (posterior) interosseous arteries. 

 The anterior gives a branch to the median nerve the comes nervi mediani a nutrient 

 branch to the radius, and, on reaching the upper edge of the pronator quadratus, sends 

 a posterior terminal branch through the membrane and an anterior terminal branch into 

 the muscle. The posterior interosseous passes beneath the oblique ligament to the back 

 of the forearm and gives off the interosseous recurrent, which runs up between the lateral 

 (external) condyle and the olecranon and then gives branches to the various muscles. 



