External occipital protuberance

External occipital protuberance
Human skull lateral view. External occipital protuberance shown in red.
Occipital bone seen from below. Outer surface. (External occipital protuberance visible at top center.)
Details
Identifiers
Latinprotuberantia occipitalis externa
TA98A02.1.04.022
TA2568
FMA75752
Anatomical terminology

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 (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]

Additional images

  • Position of external occipital protuberance (shown in red). Animation.
    Position of external occipital protuberance (shown in red). Animation.

See also

References

Public domain This article incorporates text in the public domain from page 185 of the 20th edition of Gray's Anatomy (1918)

  1. ^ Gülekon, IN (2003). "The external occipital protuberance: can it be used as a criterion in the determination of sex?". J Forensic Sci. 48 (3): 513–6. doi:10.1520/JFS2002183. PMID 12762519.
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