Extensor carpi radialis longus

  • The extensor carpi radialis longus (or extensor carpi radialis longus muscle, latin: musculus extensor carpi radialis longus) is a long muscle of the forearm that belongs to the lateral muscle group.

    The extensor carpi radialis longus lies between the brachioradialis and the extensor carpi radialis brevis on the lateral side of the forearm.

    Origin

    The extensor carpi radialis longus originates from the lateral epicondyle of the humerus.

    Insertion

    The muscle descends vertically and inserts at the base of the second metacarpal bone.

    Action

    The main functions of the extensor carpi radialis longus are extension and abduction of the hand.

    Innervation

    The extensor carpi radialis longus is innervated by the radial nerve.