Paired bones forming the upper sides and roof of the cranial vault, the parietal bones articulate with each other at the sagittal suture and with the frontal, temporal, and occipital bones around their borders.
The pterion, where the parietal, frontal, temporal, and sphenoid bones meet, is the thinnest region of the skull and overlies the anterior branch of the middle meningeal artery. A blow to the temple at the pterion can fracture the thin bone and lacerate this artery, producing an epidural haematoma that requires emergency neurosurgical evacuation. The thin squamous portion of the parietal bone overlying the temporal lobe is the most common site of penetrating head injury from a lateral blow.
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