Abductor Digiti Minimi : Origin, Insertion, Action & Nerve Supply

Abductor Digiti Minimi: The abductor digiti minimi muscle situated on the ulnar border of the palm of the hand. It forms the ulnar border of the palm and defines the hypothenar eminence of the palm together with the skin, connective tissue, and fat surrounding it.

Attachment of the Abductor Digiti Minimi

Origin:
The abductor digiti minimi muscle originate from the pisiform bone, the pisohamate ligament, and the flexor retinaculum.

Insertion:
Its distal tendon ends in three slips are inserted into the ulnopalmar margin of the proximal phalanx, the palmar plate of the metacarpophalangeal joint, and the sesamoid bone while present.
In isolated cases, accessory fascicles of the abductor digiti minimi have been seen arising from the antebrachial fascia, the radius, and the ulna.

The muscle might be joined by accessory slips from the tendon of the flexor carpi ulnaris, the flexor retinaculum, the fascia of the distal forearm, or the tendon of the palmaris longus. Occasionally, the muscle is partly inserted into the fifth metacarpal bone.

Nerve Supply of the Abductor Digiti Minimi
Innervated by the deep branch of the ulnar nerve (C8–T1).

Arterial Supply Abductor Digiti Minimi
Ulnar artery

Function of the Abductor Digiti Minimi
Abducts little (5th) finger