Editing Parietal bone (section)

===Internal===
The internal surface [Fig. 2] is concave; it presents depressions corresponding to the cerebral convolutions, and numerous furrows (grooves) for the ramifications of the [[middle meningeal artery]]; the latter run upward and backward from the sphenoidal angle, and from the central and posterior part of the squamous border.

Along the upper margin is a shallow groove, which, together with that on the opposite parietal, forms a channel, the [[sagittal sulcus]], for the [[superior sagittal sinus]]; the edges of the sulcus afford attachment to the [[falx cerebri]].

Near the groove are several depressions, best marked in the skulls of old persons, for the [[arachnoid granulations]] (Pacchionian bodies).

In the groove is the internal opening of the parietal foramen when that aperture exists.
{{Gallery|File:Gray132.png|'''Figure 1 :''' Left parietal bone. Outer surface.
|File:Gray133.png|'''Figure 2 :''' Left parietal bone. Inner surface.
|File:Left_parietal_boen_-_animation.gif|Left parietal bone (shown in green). Animation stops for a few seconds at inner and outer surface.
}}