Within the elbow, the brachial artery divides into an ulnar and a radial artery. The ulnar artery leads down the ulnar side of the forearm to the wrist. Some of the branches supply blood to the area around the elbow-joint, while others supply the flexor and extensor muscles in the lower arm. At the wrist, branches of the ulnar and radial arteries join to form a network of vessels, which supply the structures in the wrist, hand and fingers. The corresponding ulnar vein will parallel the brachial artery on its way back to the heart.
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