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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.
Definition of Osteocyte. An osteocyte is a bone-forming cell that has become entrapped within the bone matrix (the hard part of the bone). It lies within a lacuna, a small pit, and communicates with its surroundings through tiny channels called canaliculi.steocytes are mature osteoblasts that have become trapped within the very bone matrix they produced. Osteocytes continue to form bone to some degree, which is important for maintaining the strength and health of the bone matrix.