Mastoid foramen
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213954442
2008-05-21T14:36:32Z
Gracillis
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[[th:ช่องกกหู]]
{{Infobox Bone |
Name = Mastoid foramen |
Latin = foramen mastoideum |
GraySubject = 34 |
GrayPage = 141 |
Image = Gray138.png |
Caption = Left [[temporal bone]]. Inner surface. (Mastoid foramen labeled at bottom left.) |
Image2 = Gray193.png |
Caption2 = Base of the [[skull]]. Upper surface. ([[Temporal bone]] is pink, and label for mastoid foramen is at left, second from the bottom.) |
System = |
MeshName = |
MeshNumber = |
DorlandsPre = f_12 |
DorlandsSuf = 12373281 |
}}
The outer surface of the [[temporal bone]] is perforated by numerous [[Foramina of skull|foramina]]; one of these, of large size, situated near the posterior border, is termed the '''mastoid foramen'''
It transmits a vein to the [[transverse sinus]] and a small branch of the [[occipital artery]] to the [[dura mater]].
==Variations==
The position and size of this foramen are very variable; it is not always present; sometimes it is situated in the [[occipital bone]], or in the [[Cranial sutures|suture]] between the temporal and the occipital.
==Additional images==
<gallery>
Image:Gray187.png|Base of skull. Inferior surface.
</gallery>
==External links==
* {{eMedicineDictionary|Mastoid+foramen}}
* {{RocheLexicon|34257.000-1}}
* {{RocheLexicon|34257.000-2}}
* [http://www.geocities.com/akramjfr/emsry_mastoid.html Akram Abood Jaffar: Personal website, Anatomical variations]
{{Gray's}}
{{Skull}}
{{Foramina of skull}}
{{musculoskeletal-stub}}
[[hu:Foramen mastoideum]]
[[th:ช่องกกหู]]