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 posterioinferior (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
Electroencephalography (EEG) is a method to record an electrogram of the spontaneous electrical activity of the brain. The biosignals detected by EEG have been shown to represent the postsynaptic potentials of pyramidal neurons in the neocortex ...
(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
See also
*
Internal occipital protuberance
*
Occipital bun
References
External links
*
* https://web.archive.org/web/20071223042432/http://www.upstate.edu/cdb/grossanat/hnsklatob1.shtml
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Bones of the head and neck