[Location] Localized in the erect sitting position, with the palm upwards, on the wrist, at the ulnar end of the transverse crease of the wrist, in the depression on the radial side of the tendon of m. flexor carpi ulnaris. ( Fig. 9 )
 
[Regional Anatomy] Skin→subcutaneous tissue→the radial side of the tendon of m. flexor carpi ulnaris. Superficial layer, the medial antebrachial cutaneous nerve, the subordinatial branches of the basilis vein, and the palmar branches of the ulnar nerve; deep layer, the ulnar artery and vein, and the ulnar nerve.