Figure 1.

Left-hand hypothenar area. ADM: abductor digiti minimi muscle. AH: accessory head of abductor digiti minimi muscle. UA: ulnar artery. UN: ulnar nerve. AF: antebrachial fascia. PLT: palmaris longus tendon muscle. Asterisk (*): pisiform bone. 1: Dorsal cutaneous branch of ulnar nerve. 2: UN deep sensory branch trajectory. 3: Fourth common digital nerve.