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In osteology, the osteon or haversian system (/ h ə ˈ v ɜːr. ʒ ən /; 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 ]
Human bones are densely vascularized as in many other mammals. Even though some authors tried to identify a correlation between endothermy and secondary Haversian reconstruction, this feature is absent in many living mammals (e.g. monotremes, Talpa, flying foxes, Herpestes, Dasypus) and birds (Aratinga, Morococcyx, Nyctidromus, Momotus, Chloroceryle) while others possess only scattered ...
Bone canaliculi are microscopic canals between the lacunae of ossified bone.The radiating processes of the osteocytes (called filopodia) project into these canals. These cytoplasmic processes are joined together by gap junctions.
In the osteon, where matrix is separated from extracellular fluid by tight junctions, this cannot occur. In the controlled, sealed compartment, removing H + drives precipitation under a wide variety of extracellular conditions, as long as calcium and phosphate are available in the matrix compartment. [ 30 ]
Volkmann's canals, also known as perforating holes or channels, are anatomic arrangements in cortical bones that allow blood vessels to enter the bones from periosteum.They interconnect the Haversian canals (running inside osteons) with each other and the periosteum.
They are located on the surface of osteon seams and make a protein mixture known as osteoid, which mineralizes to become bone. [23] The osteoid seam is a narrow region of a newly formed organic matrix, not yet mineralized, located on the surface of a bone. Osteoid is primarily composed of Type I collagen.
More than 150 female prisoners were raped and burned to death during a jailbreak last week when fleeing male inmates set fire to a prison in Goma, in the eastern Democratic Republic of Congo, a ...
This article incorporates text in the public domain from page 90 of the 20th edition of Gray's Anatomy (1918) ^ McCreadie, Barbara R.; Hollister, Scott J.; Schaffler, Mitchell B.; Goldstein, Steven A. (2004-04-01).