Parietal bone - Definition and Area of the Skull - Human Anatomy | Kenhub
Hey everyone! It’s Matt from Kenhub, and in this tutorial, we will discuss the parietal
bone. The parietal bones are situated on both sides of the neurocranium. They form large
parts of the top and the side of the head. The bones are roughly square shaped and lie
under the vertex which is the uppermost surface of the head. Each has a concave internal surface
and a convex external surface.
The internal surface is covered with grooves for the middle meningeal artery. Other markings
are the groove for sigmoid sinus near the mastoid angle, and the groove for superior
sagittal sinus. The external surface features the superior and inferior temporal lines where
the temporal fascia and temporal muscle attach to respectively. A parietal emissary vein
connects the superior sagittal sinus with the veins of the scalp through the parietal
foramen which is located at the back of the parietal bones.
The two parietal bones meet each other in the midline of the skull roof forming a serrated
margin known as the sagittal suture. Apart from its opposite counterpart, each parietal
bone is surrounded by 4 other bones. Anteriorly, it borders with the frontal bone at the coronal
suture, posteriorly with the occipital bone at the lambdoid suture, laterally it comes
in contact with the temporal bone at the squamous suture, and sphenoid bone at the sphenoparietal
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