The Ulnar artery of the brachial artery is the larger of the two terminal branches of the median artery. It descends under the flexor carpi radialis, passes through the carpal canal on the medial face of tendon of the deep flexor and is continued as the volar common digital artery.
This vessel passes superficially underneath the deep fascia of the metacarpus along the medial border to the deep flexor tendon in company with the median nerve.
At the lower third, it gives off a branch to form the superficial volar arch. It then enters the interdigital space and divides into two volar proper digital arteries, one for each digit.
The nerve accompanies them, pass along the interdigital space of digits.
Arriving at the foramen near the extensor process of the phalanx, each passes into the foramen, enters the sinus in the interior of the bone and forms an arterial circle from which branches pass to supply the corium of the foot.
