Wrist beating mainly refers to the arteries of the forearm, including the radial artery and ulnar artery, the radial artery is located on the side of the thumb, the ulnar artery is located on the side of the little finger, the radial artery is normally the usual Chinese medicine practitioners to take the pulse commonly used parts, but also used to measure the pulse, at the same time the radial artery due to the location of the more superficial, the alignment of the relatively fixed, so it is also often used in the radial artery puncture coronary artery angiography. The ulnar artery is located on the ulnar side, which is not easy to grasp because it has more variations and branches. Of course, the radial artery and the ulnar artery together form a palmar arch and a superficial palmar arch in the palm of the hand to ensure the dual blood supply to the hand, so if the radial artery is damaged after surgical operation, it usually does not have an adverse effect on the blood supply to the arm. When the radial artery cannot be punctured, the ulnar artery can be used as an alternative.