ADM forms the lateral hypothenar eminence and is the most ulnar muscle in the palm. It is used as a pedicled flap (ADM transposition flap) for thenar eminence reconstruction in recurrent CTS.
| Origin | Pisiform and pisohamate ligament |
|---|---|
| Insertion | Ulnar base of the little finger proximal phalanx |
| Nerve Supply | Deep branch of ulnar nerve (C8, T1) |
| Blood Supply | Ulnar artery palmar branch |
| Actions |
|
|---|
It abducts the little finger and helps spread the hand when gripping large objects.
ADM is used to cover the median nerve in recurrent carpal tunnel surgery with severe scarring. In hypothenar hammer syndrome, ADM may be tender from adjacent ulnar artery compression.
Palpable as the medial hypothenar bulk during resisted little finger abduction.
ADM transposition flap covering the median nerve in recurrent CTS with significant scarring.
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