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osteoblasts large, granular cells, can't undergo mitosis, found on surface of bone form bone, secrete the osteoid: collagen, proteoglycans, glycoproteins. Osteoblast are cuboidal mononuclear bone cells 15-30 Âµm in length, which form a contiguous monolayer over the surface of bone. They are derived from marrow stromal cells by differentiation of pre-osteoblasts and not themselves undergo mitosis.
Osteocytes are osteoblasts which have become trapped inside of the bone matrix. Once an osteoblast creates the new bone around itself, it is trapped and can no longer move or form bone; this is how an osteocyte is created.