Inion
| Inion | |
|---|---|
 Midsaggital section of a human skull. Inion indicated by yellow arrow. | |
 X-ray of a human skull in lateral view. Inion indicated by yellow arrow. | |
| Identifiers | |
| TA98 | A02.1.00.018 |
| TA2 | 420 |
| FMA | 76624 |
| Anatomical terms of bone | |
The inion is the most prominent projection of the occipital bone at the posterioinferior (lower rear) part of the human 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.
The inion is used as a landmark in the 10-20 system in EEG recording.
Etymology
The word ἰνίον (iníon) is the Greek word for the occipital bone.
Additional images
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Side view of head, showing surface relations of bones. (Inion visible at center right.)
References
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See also
Wikimedia Commons has media related to Inion.
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