Levator labii superioris
2561851
185003901
2008-01-17T16:45:04Z
ELLusKa 86
2920235
iw
{{Infobox Muscle |
Name = {{PAGENAME}} |
Latin = musculus levator labii superioris |
GraySubject = 108 |
GrayPage = 383 |
Image = Levator labii superioris.png |
Caption = Muscles of the head, face, and neck. |
Image2 = |
Caption2 = |
Origin = [[Medial infra-orbital margin]] |
Insertion = Skin and muscle of the [[upper lip]] ([[labii superioris]]) |
Action = [[Elevation (kinesiology)|Elevates]] the [[upper lip]] |
Blood = [[facial artery]] |
Nerve = [[buccal branch of the facial nerve]] (C.N. VII) |
Antagonist = |
DorlandsPre = m_22 |
DorlandsSuf = 12549597 |
}}
The '''levator labii superioris''' (or '''quadratus labii superioris''') 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 (anatomy)|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]].
The lateral fibers, forming the ''zygomatic head'', arise from the malar surface of the [[zygomatic bone]] immediately behind the [[zygomaticomaxillary suture]] and pass downward and medialward to the upper lip.
==See also==
* [[facial expression]]
* [[levator labii superioris alaeque nasi]]
==Additional images==
<gallery>
Image:Gray157.png|Left maxilla. Outer surface.
Image:Gray165.png|Left zygomatic bone. Malar surface.
Image:Gray508.png|The arteries of the face and scalp.
</gallery>
==External links==
* {{MuscleLoyola|lls}}
* {{GPnotebook|-1993015216}}
* {{eMedicineDictionary|levator+labii+superioris+muscle}}
* [http://www.ptcentral.com/muscles/musclehead.html#levator%20labii%20superioris%20alaeque%20nasi PTCentral]
{{Gray's}}
{{Muscles of head}}
{{muscle-stub}}
[[Category:Muscles of the head and neck]]
[[de:Musculus levator labii superioris]]
[[es:Elevador propio del labio superior]]
[[hu:Felsőajak-emelő izom]]
[[ja:上唇挙筋]]
[[sr:Мишић подизач горње усне]]
[[sh:Mišić podizač gornje usne]]
[[fi:Ylähuulen kohottajalihas]]