[Location] With the lateral wrists towards each other on the palmar aspect, on the dorsal ulnar aspect of the forearm, in the depression on the radial side of the stuloid process of the ulna. (Fig.25)
 
[Regional Anatomy] Skin→subcutaneous tissue→extensor carpi ulnaris tendon. Superficial layer, the medial branchial cutaneous nerve, the posterior antebrachial cutaneous nerve, the dorsal branch of the ulnar nerve, and the subordinatial branches of the basilis vein; deep layer, the dorsal arterial and venous network of the wrist.