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The parietal bone is a paired, irregular, quadrilateral skull bone that forms the sides and roof of the cranium.
The parietal bone has four borders, four angles, and external/internal surfaces.
The four borders are:
- occipital (half of lambdoid suture)
- squamous temporal
The four angles are:
The external surface is convex and smooth and has several features:
- parietal eminence
- superior temporal line for attachment of temporalis fascia
- inferior temporal lines for attachment of temporalis muscle
- parietal foramen contains an emissary vein to superior sagittal sinus
The internal surface is concave and contains grooves for the middle meningeal vessels and the sagittal sulcus.
The parietal bone articulates with five other bones:
- the frontal bone via the coronal suture
- the sphenoid bone greater wing via the pterion
- the temporal bone via the squamous suture
- the occipital bone via the lambdoid suture
- the contralateral parietal bone via the sagittal suture