Levator labii superioris
|Levator labii superioris|
|Muscles of the head, face, and neck.|
|Latin||musculus levator labii superioris|
|Gray's||subject #108 383|
|Origin||Medial infra-orbital margin|
|Insertion||Skin and muscle of the upper lip (labii superioris)|
|Nerve||zygomatic branch of the facial nerve (C.N. VII)|
|Actions||Elevates the upper lip|
The levator labii superioris (or quadratus labii superioris) is a muscle of the human body used in facial expression. It is a broad sheet, the origin of which extends from the side of the nose to the zygomatic bone.
Its medial fibers form the angular head, which arises by a pointed extremity from the upper part of the frontal process of the maxilla and passing obliquely downward and lateralward divides into two slips.
One of these is inserted into the greater alar cartilage and skin of the nose; the other is prolonged into the lateral part of the upper lip, blending with the infraorbital head and with the Orbicularis oris.
The intermediate portion or infraorbital head arises from the lower margin of the orbit immediately above the infraorbital foramen, some of its fibers being attached to the maxilla, others to the zygomatic bone.
Its fibers converge, to be inserted into the muscular substance of the upper lip between the angular head and the Caninus.
Its main function is to elevate the upper lip.
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