Answer
The cranium has a pair of parietal bones. They form most of the cranial roof and part of its walls. Each parietal bone is joined to neighboring bones by four sutures-- the sagittal suture, the coronal suture, the lambdoid suture and the squamous suture.
The sagittal suture joins the two parietals ; the coronal suture binds the two parietal bones to the frontal bone; ; the lambdoid suture,--at their posterior margins--,connects the parietals to the occipital bone ; and the squamous ( or squamosal ) suture connects the parietal bones with the temporal bones. suture
Work Step by Step
Small sutural or Wormian bones are often found in the lamdoid (lambdoidal) and sagittal sutures. Wormian bones are also called sutural bones because they develop in sutures.
The parietal foramen is an opening located near the corners of the lambdoidal and the sagittal sutures. It allows passage of the parietal vein that drains the superior sagittal sinus.
Parietal lines: This is a pair of curved lines that cross the parietal and temporal bones. They mark the point of attachment--part of the origin in life-- of the large fan-shaped temporalis muscle. This muscle is important in chewing; it inserts on the mandible.
