UPPER EXTREMITY AND THORAX, ANTERIOR. 297 



There are two veins with the artery, and the interosseous 

 branch of the median nerve. 



The anterior interosseous artery supplies numerous 

 branches to the adjacent muscles, and one which follows 

 the median nerve and receives its name from this fact. 

 Sometimes this median artery is very large, passes into 

 the palm, and forms the superficial arch with the ulnar. 



The nutrient arteries for the radius and ulna are from the 

 anterior interosseous artery, (b) The posterior interosseous 

 passes directly backward between the radius and ulna, and 

 will be found in dissecting the back of the arm. 



(3) The Muscular. These are numerous and supply the 

 muscles near by. 



(4) Posterior carpal. Is given off just above the wrist- 

 joint, and turns backward under the tendon of the flexor 

 carpi ulnaris to the back of the hand. 



(5) The anterior carpal. A small artery to the front 

 of the carpus to supply this region along with the anterior 

 carpal branch of the radial. 



For the remaining branches in the hand see page 304. 



The Ulnar Nerve. Fig. 67. 



Is found entering the forearm from behind the internal 

 condyle of the humerus, then passes between the two heads 

 of the flexor carpi ulnaris, and descends upon the flexor 

 profundus digitorum. It joins the ulnar artery at the upper 

 and middle thirds of the forearm, continues at the ulnar 

 side of the artery, and with it passes over the anterior 

 annular ligament at the outer side of the pisiform bone into 

 the hand. 



In the forearm the ulnar nerve supplies filaments to the 

 flexor carpi ulnaris and the inner portion of the flexor pro- 

 fundus digitorum. 



