flexor digiti minimi brevis (muscle) of hand
flex·or di·gi·ti mi·ni·mi bre·vis (mus·cle) of hand
[TA]hypothenar muscle of palm; origin, hook of hamate bone; insertion, medial side of proximal phalanx of little finger; action, flexes little finger at the metacarpophalangeal joint; nerve supply, deep branch of ulnar.