ODM is the deepest hypothenar muscle, wrapping the fifth metacarpal. Its loss in ulnar palsy reduces palmar cupping and weakens power grip.
| Origin | Hook of hamate and flexor retinaculum |
|---|---|
| Insertion | Ulnar border of the fifth metacarpal — full length |
| Nerve Supply | Deep branch of ulnar nerve (C8, T1) |
| Blood Supply | Ulnar artery |
| Actions | Rotates and flexes the fifth metacarpal at CMC5; Deepens the palmar arch |
|---|
ODM function is tested by opposing the little finger to the thumb tip. In reconstructive surgery for ulnar palsy, ODM is addressed as part of hypothenar functional restoration.
Not individually palpable — assessed by CMC5 rotation during little finger opposition.
Loss of ODM producing flattening of the palmar arch and contributing to clawing and grip weakness.
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