Planum occipitale
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 above the highest nuchal lines is named the planum occipitale (or occipital plane), and is covered by the Occipitalis muscle
Occipitalis muscle
The Occipitalis, thin and quadrilateral in form, arises by tendinous fibers from the lateral two-thirds of the superior nuchal line of the occipital bone, and from the mastoid part of the temporal. It ends in the galea aponeurotica....

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