One parietal bone is located on each side of the skull just behind the frontal bone. It is shaped like a curved plate and has four borders. Together, the parietal bones form the bulging sides and roof of the cranium. They are fused in the middle along the sagittal suture, and they meet the frontal bone along the coronal suture. Where the two sutures meet is called the bregma. There is a gap through the parietal bone that serves as a passageway for blood vessels and nerves, called the parietal foramen.