Depressor anguli oris muscle

The depressor anguli oris muscle is a muscle of the face used in facial expression to create a frown.

Origin
The depressor anguli oris originates from the mandible, on the outer surface, posterior to the oblique line.

Insertion
The depressor anguli oris inserts at the modiolus of the mouth.

Action
The depressor anguli oris depresses the corners of the mouth and draws the angle of the mouth Lateral|laterally in a frowning motion.

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

Word origin
The depressor anguli oris muscle gets its name from the action it performs. Depressor means to depress or lower, anguli means angle, and oris means mouth; so the name means the muscle that lowers the angle of the mouth.