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Levator labii superioris

Muscle of the face

Field	Value
Name	Levator labii superioris
Latin	musculus levator labii superioris
Image	Levator labii superioris.png
Caption	Muscles of the head, face, and neck.
Origin	Medial infra-orbital margin
Insertion	Skin and muscle of the upper lip (labii superioris)
Action	Elevates the upper lip
Blood	Facial artery
Nerve	Buccal branch of the facial nerve (C.N. VII)

The levator labii superioris (: levatores labii superioris, also called quadratus labii superioris, : quadrati 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.

Structure

Its medial fibers form the angular head (also known as the levator labii superioris alaeque nasi muscle) 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 levator anguli oris.

The lateral fibers, forming the zygomatic head (also known as the zygomaticus minor muscle) arise from the malar surface of the zygomatic bone immediately behind the zygomaticomaxillary suture and pass downward and medialward to the upper lip.

Function

Its main function is to elevate the upper lip.

Additional images

File:Sobo 1909 262.png File:Sobo 1909 264.png File:Gray157.png|Left maxilla. Outer surface. File:Gray165.png|Left zygomatic bone. Malar surface. File:Gray508.png|The arteries of the face and scalp. File:Frontalis muscle animation small.gif

References

Rapini, Ronald P.. (2007). "Dermatology: 2-Volume Set". Mosby.
Eliot Goldfinger Artist/Anatomist. (7 November 1991). "Human Anatomy for Artists : The Elements of Form: The Elements of Form". Oxford University Press.
Eliot Goldfinger Artist/Anatomist. (7 November 1991). "Human Anatomy for Artists : The Elements of Form: The Elements of Form". Oxford University Press.
Clinically Oriented Anatomy 6th ed by Moore & Dalley

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

muscles-of-the-head-and-neck otorhinolaryngology human-head-and-neck facial-muscles

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