Name

# Depressor Anguli Oris

Pronunciation

(di-pres-or ang-gyO-lI or-is)

Origin/Proximal Attachment

From oblique line of mandible, lateral and below depressor labii inferioris

Insertion/Distal Attachment

Into the angle of the mouth blending with orbicularis oris and risorius.

Action/Relevance

Draws angle of the mouth down and laterally as in expression of sadness.

Innervation

Mandibular branch of the facial nerve

Notes

The depressor anguli oris muscle is one of the muscles of the mouth. It arises from the lateral surface of the mandible posterior to the oblique line. It inserts into the modiolus at the angle of the mouth.

Its action is to depress and laterally displace the angle of the mouth. This action may be assisted by posterior fibres of platysma.