O: bases of 2nd and 3rd metacarpals I: Medial side of base of proximal phalanx of thumb A: Draws 1st metacarpal laterally to oppose thumb toward center of palm and rotates it medially WikipediaQuestions
O: Hook of hamate and flexor retinaculum I: Medial side of base of proximal phalanx of little finger A: Flexes proximal phalanx of little (5th) finger WikipediaQuestions
