Origin

Insertion

Two slips:

1 – Ulnar side of fifth digit proximal phalanx

2 – Ulnar border of EDQ aponeurosis

Action(s)

Abducts fifth digit and helps flex little finger proximal phalanx at MP joint

Nerve Supply

Deep branch of ulnar nerve, C8

Arterial Supply

Ulnar artery

Physical Exam

Enter physical examination maneuvers for muscle

Clinical Importance

This muscle may contract in rheumatoid arthritis and keep the finger abducted

Disease States

Rheumatoid arthritis

Discussion

The Abductor minimi digiti (Abductor digiti quinti) is situated on the ulnar border of the palm of the hand.

It arises from the pisiform bone and from the tendon of the Flexor carpi ulnaris, and ends in a flat tendon, which divides into two slips; one is inserted into the ulnar side of the base of the first phalanx of the little finger, the other into the ulnar border of the aponeurosis of the Extensor digiti quinti proprius.

In case of polydactyly, it may insert to the sixth finger instead, if there is one.

Figures

Click thumbnail for larger image

The muscles of the left hand. Palmar surface. (Abductor digiti quinti visible at center left.)

Credits:

From Wikipedia:
Abductor minimi digiti muscle (hand)

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