Ossification of the cranium begins around the which week?

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Multiple Choice

Ossification of the cranium begins around the which week?

Explanation:
Ossification of the cranium starts when the flat bones of the cranial vault begin to form from mesenchymal tissue through intramembranous ossification. This process begins in the late first trimester, with the primary ossification centers appearing around the 11th week. The cranial base, by contrast, ossifies earlier via endochondral ossification, but the question about the cranium generally refers to the calvarial bones, whose ossification is first detectable around week 11. After birth, the sutures and fontanelles remain open to allow brain growth and gradually close over years as the skull bones fuse.

Ossification of the cranium starts when the flat bones of the cranial vault begin to form from mesenchymal tissue through intramembranous ossification. This process begins in the late first trimester, with the primary ossification centers appearing around the 11th week. The cranial base, by contrast, ossifies earlier via endochondral ossification, but the question about the cranium generally refers to the calvarial bones, whose ossification is first detectable around week 11. After birth, the sutures and fontanelles remain open to allow brain growth and gradually close over years as the skull bones fuse.

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