Obturator externus muscle
3042834
187418176
2008-01-28T06:14:41Z
Arcadian
104523
ref
{{Infobox Muscle |
Name = {{PAGENAME}} |
Latin = musculus obturatorius externus |
GraySubject = 128 |
GrayPage = 477 |
Image = Posterior Hip Muscles 1.PNG |
Caption = The obturator externus and nearby muscles |
Image2 = Gray436.png |
Caption2 = The Obturator externus. Anterior view |
Origin = [[obturator foramen]] and [[obturatory membrane]] |
Insertion = medial aspect of [[greater trochanter]] of [[femur]] |
Blood = [[obturator artery]] |
Nerve = [[posterior branch of obturator nerve]] (third and fourth [[lumbar nerves]])|
Action = [[Adduction|adduct]] [[thigh]], [[rotate laterally]] thigh |
Antagonist = |
MeshName = |
MeshNumber = |
DorlandsPre = m_22 |
DorlandsSuf = 12549920 |
}}
The '''obturator externus muscle''' is a flat, triangular muscle, which covers the outer surface of the anterior wall of the [[pelvis]].
It is sometimes considered part of of the [[medial compartment of thigh]],<ref name="isbn0-7817-5484-4">{{cite book |author=Sauerland, Eberhardt K.; Patrick W., PhD. Tank; Tank, Patrick W. |title=Grant's dissector |publisher=Lippincott Williams & Wilkins |location=Hagerstwon, MD |year=2005 |pages=129 |isbn=0-7817-5484-4 |oclc= |doi=}}</ref> and sometimes considered part of the [[gluteal]] region.<ref name="titleSummary of Lower Limb">{{cite web |url=http://mywebpages.comcast.net/WNOR/summarylistll.htm |title=Summary of Lower Limb |accessdate=2008-01-27 |format= |work=}}</ref>
==Origin and insertion==
It arises from the margin of bone immediately around the medial side of the [[obturator foramen]], viz., from the rami of the pubis, and the inferior ramus of the [[ischium]]; it also arises from the medial two-thirds of the outer surface of the [[obturator membrane]], and from the tendinous arch which completes the canal for the passage of the obturator vessels and nerves.
The fibers springing from the pubic arch extend on to the inner surface of the bone, where they obtain a narrow origin between the margin of the foramen and the attachment of the [[obturator membrane]].
The fibers converge and pass backward, lateralward, and upward, and end in a tendon which runs across the back of the neck of the femur and lower part of the capsule of the hipjoint and is inserted into the [[trochanteric fossa]] of the femur.
==Relations==
The [[obturator vessels]] lie between the muscle and the obturator membrane; the [[anterior branch of the obturator nerve]] reaches the thigh by passing in front of the muscle, and the [[Posterior branch of obturator nerve|posterior branch]] by piercing it.
==Additional images==
[[Image:Obturator_externus.png|thumb|left|200px|Muscles of the back of thigh, with insertion of obturator externus muscle labeled in purple.]]
<gallery>
Image:Gray235.png|Right hip bone. External surface.
Image:Gray344.png|Structures surrounding right hip-joint.
Image:Gray433.png|Deep muscles of the medial femoral region.
</gallery>
==References==
{{reflist}}
==External links==
* {{MuscleLoyola|obex}}
* {{GPnotebook|-1355481008}}
* {{ViennaCrossSection|pelvis/pelvis-e12-15}}
* {{NormanAnatomy|lljoints}} ({{NormanAnatomyFig|hipjointanterior}})
* [http://www.ptcentral.com/muscles/musclelegs.html#obturator%20externus PTCentral]
{{muscle-stub}}
{{Gray's}}
{{Muscles_of_lower_limb}}
[[Category:Hip muscles]]
[[de:Musculus obturator externus]]
[[es:Obturador externo]]
[[ja:外閉鎖筋]]