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The Abductor Digiti Minimi Manus is a member of the Hypothenar Eminence Group of intrinsic muscles of the hand, composed of the:
- Abductor digiti minimi manus
- Flexor digiti minimi manus
- Opponens digiti minimi
- (the Palmaris brevis could also be considered to be in the hypothenar eminence group)
ATTACHMENTS:
- The abductor digiti minimi manus attaches from the pisiform to the proximal phalanx of the little finger.
- The abductor digiti minimi manus also attaches into the distal tendon of the flexor carpi ulnaris muscle.
ACTIONS:
- Abducts the little finger at the metacarpophalangeal joint.
- Abducts the little finger at the carpometacarpal joint.
NOTE: Whenever the abductor digiti minimi manus contracts, the flexor carpi ulnaris also contracts, to stabilize the pisiform, which is the principal proximal attachment of the abductor digiti minimi manus. This is an example of proximal stabilization for distal movement.
