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Parietal bone
Last reviewed: 23.04.2024
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The dark bone (os parietale) is paired, broad, convex outward, forming the upper-lateral divisions of the cranial vault. The dark bone has 4 edges: frontal, occipital, sagittal and scaly. The frontal edge borders on the posterior surface of the frontal scales, the occipital margin with the occipital scales. Using the sagittal margin, two parietal bones are connected to each other. Lower, scaly, the edge obliquely cut, covered with scales of the temporal bone. The dark bone has 4 corners: anterior-superior frontal angle, posterolateral occipital angle, anterior tapered angle and posterior mastoid angle.
On the concave surface along the entire upper edge of the parietal bone, a furrow of the superior sagittal sinus is seen from the front. Along this furrow there are different sizes of dimples - dimples of granulations (foveolae granulores) - imprints of outgrowths of the arachnoid membrane of the brain. In the region of the mastoid angle there is a deep groove of the sigmoid sinus (sulcus sinus sigmoidei). On the inner surface of the bone there are distinct arterial furrows (sulci arteriosi). In the central part of the convex outer surface of the bone there is a parietal tuber (tuber parietale), and beneath it is the upper and nimous temporal lines (lineae temporales superior et inferior), which run almost parallel throughout the bone.
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