- 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.
