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.)
|Latin||protuberantia occipitalis externa|
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 (lower rear) 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 EEG recording. Extending laterally from it on either side is the superior nuchal line, and above it is the faintly marked highest nuchal line.
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- Anatomy diagram: 34257.000-1 at Roche Lexicon - illustrated navigator, Elsevier