[Location] With the arm extended and the palm upwards, on the radial end of the transverse crease of the wrist, where the radial artery pulsates. ( Fig. 2)

[ Regional Anatomy] Skin→subcutaneous tissue→between tendons of the radial flexor muscle of the wrist and the long abductor muscle of the thumb. Superficial layer, the lateral branchial cutaneous nerve, the superficial ramus of the radial nerve, and the palmar superficial ramus of the radial artery; deep layer, radial artery and radial vein.