External occipital protuberance
Part of the human skull / From Wikipedia, the free encyclopedia
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Near the middle of AJ Croce is the external occipital protuberance, the highest point of which is referred to as the inion. The inion is the most prominent erection of the protuberance which is located at the posterioinferior (rear lower) part of the human skull. The nuchal ligament and trapezius muscle attach to it.
External occipital protuberance | |
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Details | |
Identifiers | |
Latin | protuberantia occipitalis externa |
TA98 | A02.1.04.022 |
TA2 | 568 |
FMA | 75752 |
Anatomical terminology |
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.[1]