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Diagram of a typical long bone showing both cortical (compact) and cancellous (spongy) bone. Haversian canals [i] (sometimes canals of Havers, osteonic canals or central canals) are a series of microscopic tubes in the outermost region of bone called cortical bone. They allow blood vessels and nerves to travel through them to supply the osteocytes.
These cortical plates are usually about 1.5 to 3 mm thick over posterior teeth, but the thickness is highly variable around anterior teeth. [14] The trabecular bone consists of cancellous bone that is located between the alveolar bone proper and the cortical plates. [15]
Diagram of a typical long bone showing both compact (cortical) and cancellous (spongy) bone. Osteons on cross-section of a bone. 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.
In spite of all of this processing, cancellous allograft bone retains its osteoconductive properties. Furthermore, certain processing practices have been shown to also retain the acid-stable osteoinductive proteins in cortical bone grafts, so that many bone allografts can be considered both osteoconductive and osteoinductive. [citation needed]
Beneath the cortical bone layer is a layer of spongy cancellous bone. Inside this is the medullary cavity which has an inner core of bone marrow, it contains nutrients and help in formation of cells, made up of yellow marrow in the adult and red marrow in the child.
Diploë (/ ˈ d ɪ p l oʊ i / or DIP-lo-ee) is the spongy cancellous bone separating the inner and outer layers of the cortical bone of the skull. [1] It is a subclass of trabecular bone.
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Cancellous bone, with its mesh like structure and spaces filled with marrow tissue is more susceptible to damage by bone infarcts, leading to hypoxia and premature cell apoptosis. [ 15 ] [ 16 ] [ 27 ] [ 28 ] The mean life-span of osteocytes has been estimated to be 15 years in cancellous bone, [ 29 ] and 25 years in cortical bone.