The depressor anguli oris (triangularis) muscle is a triangular muscle that originates from the mandible at its broad base and is inserted in the angle of the mouth. It is innervated by the facial nerve (VII cranial nerve) and is supplied by the facial artery. This muscle depresses the angle of the mouth and pulls it backward, the direct opposite of the levator anguli oris and the zygomaticus major, and is used when expressing sadness. Research Depressor Anguli Oris
The levator anguli oris (triangularis labii superioris) muscle originates immediately below the maxillary foramen and extends inward and downward and is inserted in the skin at the angle of the mouth near the orbicularis oris muscle. It is innervated by the facial nerve (VII cranial nerve) and is supplied by the facial artery. This muscle raises the angle of the mouth and is one of the muscles used when smiling. Research Levator Anguli Oris
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Matt and Leela Probert
Abbreviations
Research Depressor Anguli Oris
