The arteries in the left hand are mainly the radial and ulnar artery branches. The radial artery is descending between the brachioradialis and the pronator teres muscles and penetrates to the first metacarpal space to reach the palm of the hand. Its main branches are the superficial palmar branch, which passes through the interosseous muscle at the radial carpal joint, or along its surface to the palm with the thumb artery, so that the thumb artery is distributed on the lateral and bilateral margins of the thumb metacarpal. The main branches of the ulnar artery are the common interosseous artery and the deep palmar branch. The common interosseous artery is at the upper edge of the interosseous membrane of the forearm, and is divided into the anterior interosseous artery and the posterior interosseous artery, which descend along the front and back of the interosseous membrane, respectively, and distribute to the forearm muscles and the ulna and radius. The deep palmar branch emanates from the ulnar artery on the radial side of the carpal bone and forms the deep palmar arch with the end of the radial artery.