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and lambdoid suture. At birth, the skull features a small posterior fontanelle with an open area covered by a tough membrane, where the two parietal bones adjoin the occipital bone (at the lambda). The posterior fontanelles ossify within 6-8 weeks after birth. This is called intramembranous ossification. The mesenchymal connective tissue turns into bone tissue.
* Anterior fontanelle

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