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The periosteum is secured to the underlying bone by extensions of highly resistant collagen fibers called Sharpey's fibers.
The periosteum covers the external part of the bones, except in those spaces where tendons, ligaments or joints are inserted.
From the periosteum a series of extensions come out that go to the cortical and that tie it, these extensions are called Sharpey fibers that strongly tie the periosteum to the cortical, which are highly resistant collagen fibers.
During the early ages, the periosteum is very active and Sharpey's fibers anchor the periosteum to bone very well, but as we age, the active periosteal layer thins and Sharpey's fibers become less effective.
The periosteum is very important due to its rich vascularization, which is very important in the fracture healing process.
Therefore, we can conclude that the periosteum covers the bones on the outside, in fact it is the outermost part and the link with each bone is through extensions of highly resistant collagen fibers called Sharpey's fibers.
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