Depressor anguli oris muscle

Last revised by Daniel J Bell on 17 Nov 2021

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


  • origin: oblique line of the mandible
  • insertion: 
  • innervation: facial nerve
  • action: 
    • depresses the angle of the mouth, e.g. frowning

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