NCIt definition : A paired facial muscle that originates from the incisive fossa of the mandible and
extends upward to attach to the skin of the lower lip; it functions to elevate and
protrude the lower lip and elevate and wrinkle the skin of the chin.;
Alternative definition : CDISC: A muscle of the jaw, in general extending from the incisive fossa of the mandible
to the skin of the lower lip; primary function is to elevate and protrude the lower
lip and elevate the skin of the chin.;