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A microscopic unit of mature bone composed of layers of osteocytes and bone surrounding a central canal. Also known as Haversian system.



(also haversian system), a system in the bones of vertebrates and man that consists of from five to 20 lamellae arranged concentrically around a haversian canal. It is the structural unit that gives strength to compact bone. Osteons are interspersed with interstitial lamellae. (SeeHAVERSIAN CANALS.)

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It is interesting to know that Brien and associates, (10) in a brief comment about advanced CHS of the femur, indicated that soft tissue extension developed through focal cortical destruction or by permeation through the haversian systems.
The basic functional unit of mature compact bone is the osteon or Haversian system.