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Depressor Anguli Oris is a facial muscle that plays a significant role in facial expressions. It originates from the lateral surface of the mandible (lower jaw) and inserts into the angle of the mouth (modiolus). It contributes to the formation of expressions such as frowning and sadness. Anatomical Structure Morphology and Attachment Points The depressor anguli oris is a flat, triangular, superficial muscle that arises along the oblique line of the mandible, just below the mental foramen. Its f