Periosteum is smooth layer of firm fibrous tissue covering the contacting surface of joints.
Periosteum is made up of inner cellular layer and outer fibrous layer. The outer layer is composed mostly of collagen and contains nerve fibers that cause pain when the tissue is damaged. Periosteum covers almost your entire bone . It help bone by suppling blood and help them in heal and grow properly. Periosteum help in repairing of bone in case they are damaged .
Periosteum major function is to provide a source of osteocytes/chondrocytes that differentiate from pluripotent undifferentiated mesenchymal cells. They help in scaffolding for the proliferation of osteocytes/chondrocytes. They are rich source of growth factors.
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