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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.
Osteochondromas or osteocartilaginous exostoses are the most common benign tumors of the bones.[1] The tumors take the form of cartilage-capped bony projections or outgrowth on the surface of bones (exostoses).[2] It is characterized as a type of overgrowth that can occur in any bone where cartilage forms bone.