Depressor anguli oris

  • The depressor anguli oris (also depressor anguli oris muscle, latin: musculus depressor anguli oris) is a facial muscle responsible for pulling the angle of the mouth downward.

    Origin

    The depressor anguli oris originates from the base of mandible, specifically, from the oblique line that runs posteriorly and superiorly from each mental tubercle.

    Insertion

    The depressor anguli oris inserts into the skin of the angle of the mouth.

    Action

    The main function of the depressor anguli oris is pulling the angle of the mouth downward.

    Contractions of the depressor anguli oris muscle produce facial expression of sadness.

    Innervation

    The depressor anguli oris is innervated by the marginal mandibular branch of the facial nerve (CN VII).