Inion 1386874 209439622 2008-05-01T12:07:24Z Gracillis 4775916 [[th:โหนกท้ายทอย]] {{Infobox Bone | Name = Inion | Latin = | GraySubject = 46 | GrayPage = 185 | Image = Gray1193.svg | Caption = Side view of head, showing surface relations of bones. (Inion visible at center right.) | Image2 = Gray129.png | Caption2 = Occipital bone. Outer surface. (External occipital protuberance visible at top center.) | System = | MeshName = | MeshNumber = | DorlandsPre = i_08 | DorlandsSuf = 12452346 | }} The '''inion''' is the most prominent projection of the [[occipital bone]] at the lower rear part of the [[skull]]. The [[nuchal ligament|ligamentum nuchae]] and [[trapezius muscle]] attach to it. The term '''external occipital protuberance''' (''protuberantia occipitalis externa'') is sometimes used as a [[synonym]], but more precisely the term "inion" refers to the highest point of the [[external occipital protuberance]]. ==Etymology== The word "inion" is the Greek word for the occipital bone. ==Anatolian bump== An [[Anatolian bump]] is a protuberance on the back of the skull said to be related to Asian ancestry, it is an unusually large external occipital protuberance. ==Additional images== <gallery> Image:Gray187.png|Base of skull. Inferior surface. Image:Gray1198.png|Relations of the brain and middle meningeal artery to the surface of the skull. </gallery> ==References== {{Unreferenced|date=July 2007}} {{anatomy-stub}} {{Cranium}} [[Category:Skeletal system]] [[Category:Skull]] [[it:Inion]] [[hu:Inion]] [[th:โหนกท้ายทอย]]