Depressor labii inferioris

  • The depressor labii inferioris (also depressor labii inferioris muscle, latin: musculus depressor labii inferioris) is a facial muscle of the chin area that pulls the lower lip downward and forward.

    The depressor labii inferioris originates from the oblique line of the base of the mandible and inserts into the skin of the lower lip.

    Upon activation the depressor labii inferioris muscle pulls the lower lip downward and forward. Contractions of the depressor labii inferioris produce facial expression of perseverance and diligence.

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