Fig. (2) Deeper dissection of the hand, showing the ulnar artery (1) displaced laterally. Ulnar nerve (2) trifurcation into superficial (3), Deep (4) and muscular (5) branches. The muscular branch (5) provides innervation to the lateral head of ADM (6), then passes deep to it to innervate the intermediate head (7) and medial head (8) of the ADM and the deep surface of the accessory head (9). The deep branch of the ulnar nerve (4) provides a second nerve supply to the lateral head of ADM (6). The branches to the ADM are highlighted by short pieces of silk suture. The flexor digiti minimi (10) is reflected laterally.