has muscle origin has muscle insertion facial muscle mandible depressor anguli oris muscle UBERON:0008597 The Depressor anguli oris (Triangularis) arises from the oblique line of the mandible, whence its fibers converge, to be inserted, by a narrow fasciculus, into the angle of the mouth. triangularis SCTID:361812000 musculus depressor anguli oris Wikipedia:Depressor_anguli_oris_muscle triangularis muscle depressor anguli oris FMA:46828 facial modiolus