The opponens digiti minimi (opponens digiti quinti in older texts) is a muscle in the hand. It is of a triangular form, and placed immediately beneath the palmaris brevis, abductor digiti minimi and flexor digiti minimi brevis. It is one of the three hypothenar muscles that control the little finger.^[1]

It arises from the convexity of the hamulus of the hamate bone and the 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.

The opponens digiti minimi muscle serves to flex and laterally rotate the 5th metacarpal about the 5th carpometacarpal joint, as when bringing the little finger and thumb into opposition. It is innervated by the deep branch of the ulnar nerve.

• Hypothenar
• Opponens pollicis muscle

• The muscles of the thumb. (Opponens quinti digiti visible at center right.)
• Front of the left forearm. Deep muscles. (Opponens digiti quinti visible at bottom left.)
• Bones of the left hand. Volar surface.
• Transverse section across the wrist and digits.
• Opponens digiti minimi
• Opponens digiti minimi
• Opponens digiti minimi muscle
• Muscles of hand. Cross section.