Haversian Canals


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Related to Haversian Canals: Volkmann's canals

Haversian Canals

 

(named for the English anatomist C. Havers, 1650-1702), tubular cavities in the compact matter of lamellar bone in higher vertebrates and humans. In hollow bones the Haversian canals run parallel to the longitudinal axis, in flat ones parallel to the surface, and in the bodies of the vertebrae perpendicular to the axis. Each Haversian canal is surrounded by concentrically placed bony plates (lamellae); together they form a structural unit of the bone, the Haversian system. Between lamellae in the cavities there are bone cells—osteocytes.

Inside the Haversian canals are blood vessels, nerves, and mesenchymal cells, which, in the rebuilding of bone, form osteoclasts, which resolve bone, and osteoblasts, which manufacture it. Small canals thread through the osteal lamellae and open into the Haversian canals, uniting the osteal cavities. Haversian canals of neighboring systems for some distance may unite into stable supporting structures.

V. I. KANTOROVA

References in periodicals archive ?
Lack of osteocyte nuclei was found despite presence of viable blood vessels in Haversian canals. (b) Nonirradiated viable cortical bone evident with osteocyte nuclei within lacunae and blood vessels in Haversian canals.
When studying histoarchitectonics in the longitudinal section of the diaphysis' bone wall of long bones, our attention was attracted by the amount of Haversian canals, lumen width in the longitudinal section, width of anastomoses or Volkmann's canaliculi, the anastomoses type and degree, and Haversian canals' location and the distance between them.
(11) There has been research to also indicate the nutrient rich Haversian canals within bone can act as pain-sensitive structures (29), allowing for deep-seated bone pain in daily activities.
Exudates from bone marrow cavities spread into Haversian canals and formed a kind of sockets around the blood vessels and compressed them.
Lacunae, canaliculi, and haversian canals of size varying from nano to micro meters, act as natural cavities.