levator anguli oris levator anguli oris the levator anguli oris (caninus) is a facial muscle of the mouth arising from the canine fossa, immediately below the infraorbital foramen. it elevates angle of mouth medially. its fibers are inserted into the angle of the mouth, intermingling with those of the zygomaticus, triangularis, and orbicularis oris. specifically, the levator anguli oris is innervated by the buccal branches of the facial nerve. levator anguli orisscheme showing arrangement of fibers of orbicularis oris.detailsoriginmaxillainsertionmodiolusarteryfacial arterynervebuccal branches of the facial nerveactionssmile (elevates angle of mouth)identifierslatinmusculus levator anguli oris or musculus caninusta98a04.1.03.034ta22084fma46822anatomical terms of muscle additional images seen from the inside.