The deep palmar arterial arch refers to the extensions of the ulnar artery which branch out above the wrist area. It extends down the middle of the wrist, then curves around the side into the palm of the hand, accompanied by the deep branch of the radial nerve, to form a network of nerves and blood vessels. At this point it joins the radial artery and completes the deep palmar arch in the upper area of the hand. The superficial palmar arch is usually formed by the deep palmar branch of the ulnar artery joining another branch that descends from the radial artery. The superficial arch curves across the palm and lies distally in the lower part of the hand, above the fingers. It is covered with skin, muscles and nerves. This arch gives rise to three common palmar digital arteries.