Origin: Hook of hamate and flexor retinaculum

Insertion: Medial border of 5th metacarpal

Artery: Ulnar artery

Nerve: Deep branch of ulnar nerve (C8 andT1)

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

The Opponens digiti minimi is of a triangular form, and placed immediately beneath the preceding muscles. It arises from the convexity of the hamulus of the hamate bone, and contiguous portion of the transverse carpal ligament; it is inserted into the whole length of the metacarpal bone of the little finger, along its ulnar margin.

This definition incorporates text from a public domain edition of Gray's Anatomy (20th U.S. edition of Gray's Anatomy of the Human Body, published in 1918 – from


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