periosteum vs endosteum

 periosteum vs endosteum 

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Periosteum	Endosteum
Location : external surface of bone except articular surface	Location : medullary cavity Compact bone facing marrow cavity Lined the trabeculae of spongy bone Haversian canal Volkmann’s canal
Formation : it is a connective tissue membrane formed by dense irregular connective tissue	Formation : it is formed by only one cell layer thick osteoprogenitor cells and little connective tissue
Histology:  it consists of an outer fibrous layer, and an inner cambium layer (or osteogenic layer). The fibrous layer is of dense irregular connective tissue, containing fibroblasts, while the cambium layer is highly cellular containing progenitor cells that develop into osteoblasts	Histology : Osteoprogenitor cells and bone-lining cells are difficult to distinguish at the microscopic level. They are both flattened in shape with elongated nuclei and indistinguishable cytoplasmic features. Because of their location within the bone cavities they are frequently called endosteal cells.

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