The upper, often faintly marked, is named the highest nuchal line, and to it the epicranial aponeurosis is attached.

That area of the squamous part, which lies above the highest nuchal lines is named the occipital plane (planum occipitale) and is covered by the occipitalis muscle.

The upper two fossae are triangular and lodge the occipital lobes of the cerebrum; the lower two are quadrilateral and accommodate the hemispheres of the cerebellum.

The lower division of the cruciform eminence is prominent and is named the internal occipital crest; it bifurcates near the foramen magnum and gives attachment to the falx cerebelli.

This article incorporates text in the public domain from page 129 of the 20th edition of Gray's Anatomy (1918)