How does a bone grow in length and thickness?

In thickness, the bone grows due to cell division of the inner layer of the periosteum. Bone growth in length is carried out due to growth plates (zones), which are located closer to the ends of the bones. Here, the cartilage tissue is continuously growing and replaced by bone tissue. If this layer of cartilage is ossified, then bone growth stops (this happens, as a rule, by the age of 18-20).

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