The projecting part of the occipital bone at the base of the skull.
- In these cases, the inion may be greatly enlarged.
- There is a slight occipital bunning and a very robust nuchal plane, inion, and mastoid/supramastoid region.
- For instance, bone thickness at inion averages 10.3 mm for A. afarensis and 12.8 mm for A. africanus.
Early 19th century: from Greek, literally 'nape of the neck'.
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