Back وحدة العظم Arabic Остеон Bulgarian হ্যাভারসীয় তন্ত্র Bengali/Bangla Sistema de Havers Catalan Osteon Czech Οστεώνας Greek Sistema de Havers Spanish استئون Persian Ostéon French Osteone Italian
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| Osteon | |
|---|---|
 Diagram of compact bone from a transverse section of a long bone's cortex. | |
| Details | |
| Identifiers | |
| Latin | Osteon |
| MeSH | D006253 |
| Anatomical terminology | |
In osteology, the osteon or haversian system (/həˈvɜːr.ʒən/; named for Clopton Havers) is the fundamental functional unit of much compact bone. Osteons are roughly cylindrical structures that are typically between 0.25 mm and 0.35 mm in diameter.[1] Their length is often hard to define,[2] but estimates vary from several millimeters[3] to around 1 centimeter.[1] They are present in many bones of most mammals and some bird, reptile, and amphibian species.
Histogenesis The Haversian system forms during the process of endochondral ossification, which starts with a cartilage template that is gradually replaced by bone tissue. "Osteoblasts", the bone-forming cells, secrete the organic components of bone matrix [osteoid] and then initiates its mineralization. As osteoblasts become surrounded by the bone matrix, they differentiate into osteocytes, which reside in the lacunae and maintain bone tissue. The osteocytes connect to each other and the Haversian canal via tiny canals called "canaliculi".
- ^ a b Ross, Lawrence M.; Lamperti, Edward D., eds. (2006). General Anatomy and Musculoskeletal System (Thieme Atlas of Anatomy). Thieme. p. 35. ISBN 978-1-60406-292-2.
- ^ Patterson, Janet C.; Firth, Elwyn C. (2013-06-06). The athletic horse : principles and practice of equine sports medicine (Second ed.). Elsevier Health Sciences. ISBN 978-0-7216-0075-8.
- ^ "Osteon," Encyclopædia Britannica Online (2009); retrieved 23 June 2009.
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