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External occipital protuberance

Part of the human skull

Part of the human skull

FieldValue
NameExternal occipital protuberance
Latinprotuberantia occipitalis externa
ImageExternal occipital protuberance - lateral view2.png
CaptionHuman skull lateral view. External occipital protuberance shown in red.
Image2Gray129 External occipital protuberance.png
Caption2Occipital bone seen from below. Outer surface. (External occipital protuberance visible at top center.)

Near the middle of the squamous part of occipital bone is the external occipital protuberance, the highest point of which is referred to as the inion. The inion is the most prominent projection of the protuberance which is located at the posteroinferior (rear lower) part of the human skull. The nuchal ligament and trapezius muscle attach to it.

The inion (ἰνίον, iníon, Greek for the occipital bone) is used as a landmark in the 10-20 system in electroencephalography (EEG) recording. Extending laterally from it on either side is the superior nuchal line, and above it is the faintly marked highest nuchal line.

A study of 16th-century Anatolian remains showed that the external occipital protuberance statistically tends to be less pronounced in female remains.

Additional images

References

References

  1. Gülekon, IN. (2003). "The external occipital protuberance: can it be used as a criterion in the determination of sex?". J Forensic Sci.
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This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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