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Highlighted in blue are the cement lines which mark the boundaries of present and former osteons.

Each osteon consists of parallel, concentric lamellae surrounding a Haversian canal.

These lines indicate the shape of the surface upon which osteoblasts began laying down fresh lamellae after osteoclasts had excavated a channel throught the bone.

The patterns of lamellae reflect the history of bone remodelling.  Osteons with complete concentric lamellae are the most recently formed.  Other lamellae, which terminate abruptly against a cement line, are the fragmentary remains of former osteons that have been partially removed and replaced during remodelling.

Click on a thumbnail below for additional information.

Osteons
Lacunae and canaliculi


Comments and questions: dgking@siu.edu

SIUC / School of Medicine / Anatomy / David King

http://www.siumed.edu/~dking2/ssb/NM035b1.htm
Last updated:  12 December 2003 / dgk