parietal bone
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The parietal bone is a bone in the human skull that, when paired with its counterpart, forms the sides and roof of the cranium (the main part of the skull that holds the brain). It matters because it provides structural support and protection for the brain, one of the body's most vital organs.
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Article
The parietal bones (/pəˈraɪ.ətəl/ pə-RY-ə-təl) are two bones in the skull which, when joined at a fibrous joint known as a cranial suture, form the sides and roof of the neurocranium. In humans, 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.
Surfaces