Inion
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| Bone: Inion | |
|---|---|
| Side view of head, showing surface relations of bones. (Inion visible at center right.) | |
 | |
| Occipital bone. Outer surface. (External occipital protuberance visible at top center.) | |
| Gray's | subject #46 185 |
| Dorlands / Elsevier | i_08/12452346 |
The inion is the most prominent projection of the occipital bone at the lower rear part of the skull. The 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, not to be confused with an external occipital protuberance.
Additional images
 Base of skull. Inferior surface. |
 Relations of the brain and middle meningeal artery to the surface of the skull. |
References
it:Inion
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
