Parietal bone
Parietal bone
The parietal bone is a bone in the human skull which, when joined together, form the sides and roof of the cranium. Each bone is roughly quadrilateral in form, and has two surfaces, four borders, and four angles. It is named from the Latin paries (-ietis), wall.
Structure
The parietal bone articulates with the frontal bone via the coronal suture. Posteriorly, it articulates with the occipital bone via the lambdoid suture. The sagittal suture joins the two parietal bones together. Lastly, it articulates with the temporal bone via the squamosal suture.
Borders
The parietal bone has four borders:
- The frontal border is part of the coronal suture.
- The sagittal border is part of the sagittal suture.
- The occipital border is part of the lambdoid suture.
- The squamous border is part of the squamosal suture.
Angles
The parietal bone has four angles:
- The frontal angle is the point at which the bone begins to curve inward.
- The occipital angle is the point at which the bone begins to curve outward.
- The sphenoidal angle is the point at which the bone begins to curve inward.
- The mastoid angle is the point at which the bone begins to curve outward.
Development
The parietal bone is ossified in membrane from a single center, which appears at the parietal eminence about the eighth week of fetal life.
Clinical significance
Damage to the parietal lobe can result in sensory loss, impaired spatial processing, and disorders of language.
See also
References
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External links
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