nerve lies on the medial side of the lower two-thirds of the artery, and the palmar cutaneous branch of the nerve descends on the lower part of the vessel to the palm of the hand. Wrist At the wrist the ulnar artery is covered by the integument and the volar carpal ligament, and lies upon the Flexor retinaculum of the hand. On its medial side is the pisiform bone, and, somewhat behind the artery, the ulnar nerve. Peculiarities The ulnar artery varies in its origin in the proportion of about one in thirteen cases; it may arise about 5 to 7 cm. below the elbow, but more frequently higher, the brachial being more often the source of origin than the axillary. Variations in the position of this vessel are more common than in the radial. When its origin is normal, the course of the vessel is rarely changed. When it arises high up, it is almost invariably superficial to the Flexor muscles in the forearm, lying commonly beneath the fascia, more rarely between the fascia and integument. In a few cases, its position is subcutaneous in the upper part of the forearm, and subaponeurotic in the lower part. See also Allen test Additional images References External links Arteries of the upper limb