Opponens pollicis

  • The opponens pollicis (or opponens pollicis muscle, latin: musculus opponens pollicis) is one of the four thenar muscles lying on the radial side of the palm.

    The opponens pollicis lies beneath the abductor pollicis brevis and lateral to the flexor pollicis brevis.

    Origin

    The opponens pollicis originates from the flexor retinaculum and from the trapezium bone.

    Insertion

    The opponens pollicis passes forwards and inserts onto the base of the first metacarpal bone.

    Action

    The main function of the opponens pollicis is to oppose the thumb.

    Innervation

    The opponens pollicis is innervated by the median nerve.