Depressor labii inferioris muscle

The depressor labii inferioris muscle is a muscle of the face that connects the mandible (jaw bone) to the skin of the lower lip. When contracted, it pulls the lower lip downward.

Origin
The depressor labii inferioris muscle originates from the mandible, on the outer surface along the oblique line.

Insertion
The depressor labii inferioris muscle inserts into the skin of the lower lip medial to the modiolus of the mouth

Action
The depressor labii inferioris muscle depresses and draws the lower lip Lateral|laterally.

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