Name
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.