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n. (context anatomy English) Any of the central canals, and surrounding bony layers, found in compact bone.


The osteon or haversian system (named for Clopton Havers) is the fundamental functional unit of much compact bone. Osteons are roughly cylindrical structures that are typically several millimeters long and around 0.2mm in diameter. They are present in many bones of most mammals and some bird, reptile, and amphibian species.

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In living tissue osteons are born, nourished, and eventually replaced by newer units.