THE ULNAR ARTERY 



581 



5. The volar ulnar carpal [ramus carpeus volaris] is a small branch given off 

 from the ulnar artery opposite the carpus. It passes beneath the flexor digitoruro 

 profundus to anastomose with the volar radial carpal, with terminal twigs of the 

 volar branch of the volar interosseous, and with recurrent branches from the 

 deep volar arch, forming an anastomotic arch across the front of the carpus — the 

 volar carpal arch or rete. 



Fig. 473. — The Arteries of the Right Forearm and the Deep Volar Arch. 



-Superior ulnar collateral 

 -Inferior ulnar collateral 



Brachial artery - 

 Radial recurrent artery- 



-Brachialis muscle 

 ■ Volar ulnar recurrent 

 .Dorsal ulnar recurrent 



Brachio-radialis ■ 



Radial artery - 



•Ulnar artery 



Flexor poUicis longus muscle • 



'Volar interosseous artery 

 ■Flexor carpi ulnaris 



-Flexor digitorum profundus muscle 

 -Volar interosseous artery 



Transverse carpal ligament, cuf- 



■ Volar branch of ulnar artery, cut 

 'Deep volar arch 



1/^^ 



'Volar metacarpal arteries 

 -Volar digital artery, cut short 



Volar digital artery ' 



^L- 



The Ulnar Artery at the Wrist 



The ulnar artery at the wrist may be said to extend from the upper to the 

 lower border of the transverse carpal (anterior annular) ligament upon which 

 It rests. It here lies immediately to the radial side of the pisiform bone, and 

 to the ulnar side of the hook of the hamate (unciform), the two bones forming 

 for the vessel a protecting channel, which is further converted into a short canal 

 by the expansion of the flexor carpi ulnaris passing from the pisiform to the hook 

 of the hamate (unciform). The ulnar nerve in this situation is immediatelv to 

 the ulnar side of the artery. 



