Extensor digiti minimi

  • The extensor digiti minimi (also extensor digiti minimi muscle, extensor digiti quinti proprius, latin: musculus extensor digiti minimi) is a slender, superficial muscle of the forearm that belongs to the posterior muscle group and lies in the first or superficial layer.

    Origin

    The extensor digiti minimi originates from the lateral epicondyle of the humerus.

    Insertion

    The extensor digiti minimi inserts at the bases of the intermediate and distal phalanges of the fifth finger, also known as the little finger.

    Action

    The main function of the extensor digiti minimi is extension of the fifth digit.

    Innervation

    The extensor digiti minimi is innervated by the radial nerve.