Haversian canal
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Haversian canal | |
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Identifiers | |
FMA | 224787 |
Anatomical terminology |
Haversian canals
Structure
Each Haversian canal generally contains one or two
Haversian canals are contained within osteons, which are typically arranged along the long axis of the bone in parallel to the surface. The canals and the surrounding lamellae (8-15) form the functional unit, called a Haversian system, or osteon.
Clinical significance
Fracture
Blood vessels in the Haversian canals are likely to be damaged by bone fracture.[2] This can cause haematoma.[2]
Rheumatoid arthritis
Haversian canals may be wider in patients with rheumatoid arthritis.[3] They are also more likely to contain osteoclasts that break down bone structure.[3] These differences are studied with light microscopy.[3]
History
Haversian canals were first described (and probably discovered) by British physician Clopton Havers, after whom they are named.[4] He described them in his 1691 work Osteologica Nova.[5]
In different animals
Human bones are densely vascularized as in many other mammals. Even though some authors tried to identify a correlation between
Notes
- Parkinson disease); for more, see eponym > orthographic conventions.
References
- ISBN 978-0-08-088504-9, retrieved 2021-01-15
- ^ ISBN 978-0-12-088467-4, retrieved 2021-01-15
- ^ ISBN 978-0-12-801238-3, retrieved 2021-01-15
- PMID 27843061.
- ^ Havers, Clopton (1729). Osteologia Nova: Or, Some New Observations of the Bones, and the Parts Belonging to Them; with the Manner of Their Accretion and Nutrition: Communicated to the Royal Society in Several Discourses ... To which is Added, a Fifth Discourse, of the Cartilages. The Second Edition. By Clopton Havers . W. Innys.
- ^ .
- ^ Enlow, Donald H. (1969). "The bones of reptiles". Biology of the Reptilia. Vol. 1. Academic Press. pp. 45–81.
External links
- http://www.lab.anhb.uwa.edu.au/mb140/ Archived 2010-12-01 at the Wayback Machine
- "Bone Anatomy - Haversian canals within bone". November 4, 2006. Archived from the original on 2021-12-13 – via YouTube. Video of haversian canal system within cortical bone.
Additional images
-
Bone by decalcification (40x):
- Volkmann's canal
- Haversian canal
- Blood vessel
-
Bone by decalcification (100x):
- Volkmann's canal
- Haversian canal
- Lacuna
- Lamella