|Side view of head, showing surface relations of bones. (Inion visible at center right.)|
|Occipital bone. Outer surface. (External occipital protuberance visible at top center.)|
|Gray's||subject #46 185|
The term external occipital protuberance (protuberantia occipitalis externa) is sometimes used as a synonym, but more precisely the term "inion" refers to the highest point of the external occipital protuberance.
The word "inion" is the Greek word for the occipital bone.
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