Ulnar artery
The ulnar artery, the larger of the two terminal branches of the brachial, begins a little below the bend of the elbow in the cubital fossa, and, passing obliquely downward, reaches the ulnar side of the forearm at a point about midway between the elbow and the wrist.It is accompanied by two venæ comitantes, and is overlapped in its middle third by the Flexor carpi ulnaris; the ulnar 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.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.The ulnar artery varies in its origin in the proportion of about one in thirteen cases; it may arise about 5 to 7 cm.This article incorporates text in the public domain from page 595 of the 20th edition of Gray's Anatomy (1918)