attached to lateral to superficial to muscles innervated by the facial nerve orbicularis oris muscle platysma muscle depressor labii inferioris muscle depressor anguli oris muscle UBERON_0008597 A muscle of facial expression, innervated by the facial nerve, attached to the mandible, skin of the lower lip in the region of the angle of the oral opening, orbicularis oris, and lateral to the depressor anguli oris muscle. mandible bone lower lip