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The osteon is the primary structure that makes up the hard outer layer of bones, which is generally known as â cortical bone .â Cortical bone, or compact bone, is dense, mature bone found in vertebrates such as mammals, amphibians, reptiles, and birds. It is this dense hard layer that gives a person or animal strength.
1 These bone building cells arise from the osteoprogenitor cells in periosteum in bone marrow. 2  monomucleate cells, expressess all receptors of the fibroblassts in addition to genes for sialoprotein and osteocalcin.3  Consists of high amount of RER large Golgi apparatus with spherical nucleus.ONE BUILDING CELLSBone can be defined as the rigid endoskeleton of calcium phosphate and forms the endoskeleton of the body. The skeletal system formed by the bones is the unit that is associated with the muscular system that enables movement.