Depressor anguli oris

Dr Dan J Bell et al.

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


  • origin: oblique line of the mandible
  • insertion: 
    • angle of the mouth
    • superficial fibres from both sides merge to form the transversus menti
  • innervation: facial nerve
  • action: 
    • depresses the angle of the mouth, e.g. frowning
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Article information

rID: 55052
System: Head & Neck
Section: Anatomy
Synonyms or Alternate Spellings:
  • triangularis

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