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Haversian system

noun, (sometimes lowercase) Anatomy
a Haversian canal and the series of concentric bony plates surrounding it.
1835-45; see Haversian canal Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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haversian-system in Medicine

haversian system n.
See osteon.

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 haversian-system

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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