580 



THE BLOOD-VASCULAR SYSTEM 



of this muscle and just above the wrist joint, with the dorsal branch of the volar interosseous 

 which here, as above described, has perforated the interosseous membrane. It is separated 

 from the deep radial nerve at first by the radius and supinator, and on the back of the forearm 

 by the extensores poUicis longus and indicis proprius. 



The chief branch of the dorsal interosseous artery, the interosseous recurrent artery [a. 

 interossea recurrens] arises from the dorsal interosseous as the latter emerges from beneath 

 the supinator. It runs upward between the anconeus and supinator, usually under cover 

 of the former, to the interval between the lateral epicondyle and the olecranon, where it anas- 

 tomoses with the profunda, inferior ulnar collateral, radial recurrent, and dorsal ulnar recurrent 

 arteries, and gives branches to the retiform plexus over the olecranon — the rete olecrani. 



Fig. 472. — Anastomoses and Distribution of the Arteries of the Hand. (Walsham.) 

 Volar interosseous. 

 Radial artery , 



Volar radial carpal 



Superficial volar 



Dorsal radial carpal 

 Radial artery at wrist 



First dorsal 

 metacarpal 

 Second dorsal 

 metacarpal 



Princeps pollicis 

 First dorsal meta- 

 carpal (branch to 

 index) 



Radialis indicis 



— Ulnar artery 

 Volar ulnar 

 carpal 



_ Dorsal ulnar 

 carpal 



Deep ulnar 



Superficial arch 



Carpal re- 

 current 



Dorsal per- 

 forating 



Volar meta- 

 carpals 



Common volar 

 digitals 



Dorsal meta- 

 carpals 

 Common volar 

 digital 



Volar per- 

 forating 



Dorsal digital 



Volar digital 



First dorsal branch of volar digital 



Second dorsal branch of volar digital 



Anastomosis of volar digital arteries 

 about matrix of nail and pulp of 

 finger 



3. 'J'hc muscular branches [rami muscularcsj are numerous. They supply 

 the deep and superficial flexors of the fingers, the flexor carpi radialis and ulnaris, 

 and the pronator radii tores. » 



4. The dorsal ulnar carpal [ramus carpeus dorsalis] comes off from the ulnar! 

 artery a little alcove the transverse carpal (anterior annular) ligament, and,1 

 winding medially round the (>nd of the ulna or the ulnar collateral ligament of the'! 

 wrist, beneath the flexor carpi ulnaris, ramifies on the ba(;k of the carpus beneath 

 the extensor tendons. It forms by its anastomosis with the dorsal radial carpal, 

 with the dorsal terminal branch of the volar interosseous and with the dorsal,' 

 interosseous arteries a plexus or rete, the so-called dorsiil carpal rete. The I 

 branches given off from this plexus or arch are described with the dorsal carpal 

 branch of the radial artery. 



