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]]