depressor labii inferioris (muscle)

de·pres·sor la·bi·i in·fe·ri·o·ris (mus·cle)

[TA] facial muscle of mouth; origin, anterior portion of base of mandible; insertion, interdigitates with fibers of orbicularis oris musculus to reach skin of lower lip; action, depresses lower lip; nerve supply, facial. Synonym(s): musculus depressor labii inferioris [TA], depressor muscle of lower lip, musculus quadratus labii inferioris, musculus quadratus menti