542 



THE ARTERIES 



osseous muscles as far as the flexure of the fingers, and there divide into two 

 hranches (dorsal digital), which run along the sides of the contiguous fingers on 

 their dorsal aspect. Near their proximal ends they anastomose with the posterior 

 perforating branches of the deep palmar arch. Distally they are connected by 

 anterior perforating branches with the digital arteries of the corresponding spaces. 



Fig. 358. — The Radial Arteky at the Wrist, Left Forear.m. 

 ^Fiom a dissectiou in the Hunterian Mu.seum.) 



Articular branch of super wr 

 prnfunda 



Brachialis auticus 

 Supinator lougus, cut 



Common extensor tendon 



Extensor carpi radialis longior 

 and brevior 



Supinator brevis 



Posterior interosseous artery 



Extensor ossis metacarpi poUiois 

 Supinator longus, cut 



Extensor primi interuodii poUicis 



Posterior annular ligament 



Extensor carpi radialis longior 



Badial artery 



Boj-salis poinds artery 



Extensor seeundi internodii 



poUicis 



First dorsal interosseous muscle 



Dorsalis indicia artery 



Princeps poUicis artery 



Dorsal digital artery 



Triceps 



Rete over olecranon 

 Interosseous recurrent artery 



Anconeus, cut 



Extensor carpi ulnaris 

 Flexor carpi ulnaris 



Posterior liranch of anterior interosseous 



Wl artery 



Interosseous membrane 



Posterior ulnar carpal artery 

 Extensor carpi radialis brevior 

 Posterior radial carpal artery 



Third dorsal interosseous artery 

 Second dorsal interosseous artery 

 Metacaipal or first dorsal interosseous 

 artery 



The branches which run along the backs of tin- fingers anastomose witli tlie dorsal 

 branches of the collateral diirital arteries derived from the palmar digital vessels 

 (% 359). 



(2) The metacarpal or first dorsal interosseous artery (figs. 358, 859) 

 arises from the radial artery beneath the extensor seeundi internodii ])ollicis, and, 

 crossing the second metacarpal ])one, i)asses downwards on the seetnid dorsal 



