Opponens Digiti Minimi

Opponens Digiti Minimi

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Opponens Digiti Minimi

The opponens digiti minimi is a hypothenar muscle located within the hand. It lies deep in relation to other muscles in the hypothenar region. Understanding its attachments, innervation, and actions helps illustrate the important role this muscle plays.


The opponens digiti minimi originates from the hook of hamate and the associated flexor retinaculum.


The opponens digiti minimi inserts onto the medial margin of the fifth metacarpal.


The main action of the opponens digiti minimi is opposition of the little finger.


The muscle is innervated by the ulnar nerve.

Blood Supply

The opponens digiti minimi is supplied by the deep palmar arch.


The opponens digiti minimi plays an important role within the human hand. It works in combination with the other muscles of the hypothenar region to stabilize and support the hand during movement. It works in conjunction with the fourth lumbrical to flex the little finger at the proximal interphalangeal joint. Additionally, it functions to oppose the other digits when grasping objects.

Clinical Relevance

Injury to the opponens digiti minimi and other hypothenar muscles can result in weakened grip strength, decreased range of motion, and difficulty in fine motor skills. In severe cases, the tendon can rupture and require surgical repair. Physical therapy can be utilized to help restore strength and functionality to the hand. Limited range of motion, weakness, and tenderness in the hand should be addressed to prevent further injury or impaired function.


The opponens digiti minimi plays a crucial role in hand stability, movement, and strength. Understanding its attachments, insertions, actions, innervation, and blood supply is essential for a complete grasp of its importance. Injuries to the muscle can result in impaired hand function, grip strength, and range of motion, and can require surgical intervention and physical therapy. Therefore, it is important to be aware of any issues with the hand or opponens digiti minimi in order to prevent further damage and maintain functionality.

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