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Interossei

(Science: anatomy, muscle) palmar Division: origin, medial side, second metacarpal and lateral side, fourth and fifth metacarpals; insertion, medial side, base first phalanx, index, ring and little fingers and tendon extensor digitorum; action, adduct the fingers, flex the first phalanx, extend second and third.

dorsal Division: origin, adjacent sides, second through fifth metacarpals; insertion, lateral aspects of phalanges; action, abduct fingers, flex first phalanx, extend second and third