Origin

Hook of hamate and flexor retinaculum

Insertion

Medial border of 5th metacarpal

Action(s)

Draws 5th metacarpal anteriorly and rotates it, bringing little finger (5th digit) into opposition with thumb

Nerve Supply

Deep branch of ulnar nerve (C8 and T1)

Arterial Supply

Ulnar artery

Physical Exam

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Clinical Importance

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Disease States

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Discussion

The opponens minimi digiti (opponens digiti quinti in older texts) is of a triangular form, and placed immediately beneath the palmaris brevis, abductor minimi digiti, and flexor brevis minimi digiti.

It arises from the convexity of the hamulus of the hamate bone, and contiguous portion of the transverse carpal ligament.

Figures

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Credits:

From Wikipedia:
Opponens digiti minimi

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