Accessory abductor digiti minimi muscle (hand)

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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 5 metacarpophalangeal joint