Palumbo et al.(1990) distinguish three cell types from osteoblast to mature osteocyte: type I preosteocyte (osteoblastic osteocyte), type II preosteocyte (osteoid osteocyte), and type III preosteocyte (partially surrounded by mineral matrix).[9] The embedded osteoid-osteocyte must do two functions simultaneously: regulate mineralization and form connective dendritic processes, which requires cle