The ulnar and the radial arteries course distally down the forearm and are responsible for all the blood supply to the hand. The palmar carpal branch of the ulnar artery passes laterally across the anterior aspect of the distal ulna and deep to the tendons of the flexor digitorum profundus. The corresponding palmar carpal branch of the radial artery stems just distal to the inferior edge of the pronator quadratus, then continues inferomedially along the anterior aspect of the distal radius, also deep to the flexor muscles. These two vessels anastomose centrally to form the palmar carpal arch, which is responsible for the vascular supply of the anterior wrist (Gray 1918).