Origin: Hamate bone
Insertion: Little finger
Artery: Ulnar artery
Nerve: Deep branch of ulnar nerve
Action: Flexes little finger
Antagonist: Extensor digiti minimi muscle
The Flexor digiti minmi brevi lies on the same plane as the preceding muscle, on its radial side. It arises from the convex surface of the hamulus of the hamate bone, and the volar surface of the transverse carpal ligament, and is inserted into the ulnar side of the base of the first phalanx of the little finger. It is separated from the Abductor, at its origin, by the deep branches of the ulnar artery and nerve. This muscle is sometimes wanting; the Abductor is then, usually, of large size.