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The Levator Labii Superioris Muscle is a muscle responsible for elevating the upper lip and plays an important role in facial expressions. Also known as the quadratus labii superioris , it consists of three anatomical heads: the angular head (levator labii superioris alaeque nasi), the infraorbital head, and the zygomatic head (closely related to the zygomaticus minor). Anatomy Morphology and Connection Points The Levator Labii Superioris Muscle is a multi-headed muscle responsible for facial ex