FOREARM AND HAND 



187 



interosseous nerve, it 

 gives branches both to 

 the supinator and to 

 the extensor carpi 

 radialis brevis. After 

 forearm, as the dorsal 



Brachial artery 



Profunda artery of 

 the arm 



Superior ulnar 

 collateral artery 



distally between the superficial and deep muscles on the 

 back of the forearm. At the proximal border of the extensor 

 pollicis longus, it leaves the dorsal interosseous artery, dips 

 anterior to the extensor pollicis longus, and joins the per- 

 forating branch of the 

 volar interosseous 

 artery on the dorsal 

 aspect of the interosse- 

 ous membrane. Ac- 

 companied by that 

 artery it descends, 

 through the most medial 

 groove on the back of 

 the radius with the ten- 

 dons of the extensor 

 digitorum communis 

 and the extensor indicis 

 proprius, to the back of 

 the wrist where it ends 

 in a gangliform enlarge- 

 ment which lies between 

 the extensor tendons 

 and the posterior liga- 

 ment of the wrist. 



The branches which 

 spring from the dorsal 

 interosseous nerve in 

 the forearm are given 

 entirely to muscles. 

 Before the deep branch 

 of the radial nerve 

 pierces the supinator 

 and becomes the dorsal 



Inferior ulnar 

 collateral artery 



Ant. terminal 

 branch of profunda 

 artery 



Radial artery 



Ulnar artery 



.., Ulnar recurrent 

 '-' arteries 



Interosseous recurrent artery 

 _ Dorsal interosseous artery 

 -Volar interosseous artery 



FIG. 80. Diagram of Anastomosis around 

 the Elbow Joint. 



it appears on the dorsum of the 

 interosseous nerve, it supplies the 

 extensor digitorum communis, the extensor digiti quinti pro- 

 prius, the extensor carpi ulnaris, the abductor pollicis longus, 

 two extensors of the thumb, and the extensor indicis proprius. 



