Discussion
What is approximately the number of centers of ossification at birth ?
Answer: B
About 450 centres of ossification are present at birth.
The skeleton develops from about 806 centres of ossification in all, primary and secondary. Around 450 of them have appeared by birth, and the rest, mostly secondary centres in the epiphyses, appear during childhood and adolescence. As they fuse, the number of separate bones falls to the 206 of the adult skeleton.
So 806 is the total number of centres over life and 206 the adult bone count; neither is the number at birth. 600 does not correspond to any standard figure.
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