An accessory abductor digiti minimi (ADM) muscle is the commonest accessory muscle of the hypothenar eminence, found in 24% individuals. When present it is one of the intrinsic muscles of the hand.
Summary
origin:
antebrachial fascia passing anteriorly to Guyon canal
occasionally arises from the palmaris longus tendon
insertion: abductor digiti minimi (ADM) muscle
or an insertion discrete from the ADM proper, into medial aspect of the base of the proximal phalanx
arterial supply: ulnar artery
innervation: deep branch of ulnar nerve
action: flexion of the 5th metacarpophalangeal joint
Summary
origin:
antebrachial fascia passing anteriorly to Guyon canal
occasionally arises from the palmaris longus tendon
insertion: abductor digiti minimi (ADM) muscle
or an insertion discrete from the ADM proper, into medial aspect of the base of the proximal phalanx
arterial supply: ulnar artery
innervation: deep branch of ulnar nerve
action: flexion of the 5th metacarpophalangeal joint
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