Planum nuchale
Encyclopedia
That part of the squama occipitalis
Squama occipitalis
The squama of the occipital bone, situated above and behind the foramen magnum, is curved from above downward and from side to side.- External surface :...

 which lies below the highest nuchal lines is termed the planum nuchale (or nuchal plane), is rough and irregular for the attachment of several muscles.
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