Abductor Digiti Minimi

- Anatomy:
    - origin:
         - pisiform bone and from the tendon of the FCU ;
    - insertion:
         - two slips; into ulnar side of the base of proximal phalanx of little finger;
         - into ulnar border of aponeurosis of  extensor digiti minimi  expansion of finger extensor tendons;
    - action:
         - abducts little finger & helps flex its proximal phalanx at MP joint;
    - synergists:
         -  flexor gigiti minimi brevis, oppenens digiti minimi;
    - nerve supply: ulnar nerve from brachial plexus, C8;

- Discussion:
    - this muscle may contract in R.A. and keep the finger abducted;
    - flexor brevis digiti minimi lies on volar surface of hypothenar area w/ small separation between it & abductor of little finger;
    - thru this interval run the deep branches of the ulnar art. & nerve into the subtendinous part of the palm of the hand;

  Abductor digiti quinti opponensplasty.

Original Text by Clifford R. Wheeless, III, MD.

Last updated by Data Trace Staff on Friday, December 2, 2011 2:54 pm