The periosteum is not bone, but what an unexpected, amazing phenomenon this part of the bone tissue represents! Of course, it plays a vital role in protecting the inner surface of the skull, bony protrusions and ends of bones from friction, compression and damage. But does this membrane really have no other functions besides the banal function of protection? It turns out that it is thanks to the periosteum that our growth occurs: due to it, the cell can grow into the bone and grow further.