Endost

Endosteum forms the lining of the medullary cavity, trabecular spongiosy, Volkmann's canals and the Haversian system. It is one row of flat cells with a flattened nucleus, consisting essentially of two types of cells, which, however, cannot be distinguished with a light microscope, namely:
 * osteoprogenitor cells that can differentiate into osteoblasts,
 * covering cells. 607 Periosteum and Endosteum.jpg

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