Mastoid foramen 4734367 213954442 2008-05-21T14:36:32Z Gracillis 4775916 [[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]]