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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.
Photo taken by Dr. S. Desai. Each osteon looks looks like tree rings. The large holes in the center of each osteon (tree) is a central canal. The ants are the lacuna (the holes that house the osteocytes) and the legs of the ants are canaliculi (singular canaliculus; that allow the osteocytes to touch each other).