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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.
The central compartment or tunnel in the osteon which contains areolar connective tissue, blood and lymphatic vessels and nerve fibers. concentric lamellae The thin cylindrical plates, or layers of bone matrix (produced by osteoblasts) around the minute vascular central canals in compact bone, which in cross-section produce a pattern of circles of different size, one within another, having a common center.