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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.
Compact Bone. The diagram above shows a transverse view of an osteon (Haversian system) - the basic unit of compact bone. The diagram above shows a longitudinal view of an osteon. Some, mostly older, compact bone is remodelled to form these Haversian systems (or osteons).The osteocytes sit in their lacunae in concentric rings around a central Haversian canal (which runs longitudinally).ompact Bone. The diagram above shows a transverse view of an osteon (Haversian system) - the basic unit of compact bone. The diagram above shows a longitudinal view of an osteon. Some, mostly older, compact bone is remodelled to form these Haversian systems (or osteons).