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osteon in Medicine

osteon os·te·on (ŏs'tē-ŏn') or os·te·one (-ōn')
A central canal and the concentric osseous lamellae encircling it, occurring in compact bone. Also called haversian system.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Article for osteon

haversian system

the chief structural unit of compact (cortical) bone, consisting of concentric bone layers called lamellae, which surround a long hollow passageway, the haversian canal (named for Clopton Havers, a 17th-century English physician). The haversian canal contains small blood vessels responsible for the blood supply to osteocytes (individual bone cells). Osteons are several millimetres long and about 0.2 millimetre (0.008 inch) in diameter; they tend to run parallel to the long axis of a bone.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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