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Parietal bone
(section)
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== Ossification == The parietal bone is ossified in membrane from a single center, which appears at the [[parietal eminence]] about the eighth week of fetal development. Ossification gradually extends in a radial manner from the center toward the margins of the bone; the angles are consequently the parts last formed, and it is here that the fontanelles exist. Occasionally the parietal bone is divided into two parts, upper and lower, by an antero-posterior suture.
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