As of the latest update, Google Chrome and Microsoft Edge have made a breaking change to how file uploads are handled. Once your system installs this update, you will not be able to upload new images. Please use another browser until we can get it fixed.

Depressor anguli oris muscle

Dr Daniel J Bell et al.

The depressor anguli oris muscle (also known as the triangularis muscle) is one of the muscles of facial expression.

Summary

  • origin: oblique line of the mandible
  • insertion: 
    • angle of the mouth
    • superficial fibers from both sides merge to form the transversus menti
  • innervation: facial nerve
  • action: 
    • depresses the angle of the mouth, e.g. frowning
Anatomy: Head and neck

Anatomy: Head and neck

Share article

Article information

rID: 55052
System: Head & Neck
Section: Anatomy
Synonyms or Alternate Spellings:
  • Depressor of the angle of the mouth muscle
  • Depressor anguli oris
  • Triangularis muscle

Support Radiopaedia and see fewer ads

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.