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Drifting osteons are a phenomenon that is not fully understood. A "drifting osteon" is classified as one that runs both longitudinally as well as transversely through the cortex. An osteon can "drift" in one direction or change directions several times, leaving a tail of lamella behind the advancing
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fibers in a particular lamella run parallel to each other, but the orientation of collagen fibers within other lamellae is oblique. The collagen fiber density is lowest at the seams between lamellae, accounting for the distinctive microscopic appearance of a transverse section of osteons. The space
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Each
Haversian canal is surrounded by varying number (5-20) of concentrically arranged lamellae of bone matrix. Near the surface of the compact bone, the lamellae are arranged parallel to the surface; these are called circumferential lamellae. Some of the osteoblasts develop into osteocytes, each
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Osteons and their arrangement vary according to taxon, so that genus and sometimes species can be differentiated using a bone fragment not otherwise identifiable. However, there is considerable variability among the different bones of a skeleton, and features of some faunal osteons overlap with
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In recent decades, osteohistological studies of dinosaur fossils have been used to address a number of issues, such as the periodicity of growth of dinosaurs and whether it was uniform across species and the question of whether dinosaurs were warm-blooded or not.
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those of human osteons; therefore, examination of osteons is not of primary use in the analyses of osteological remains. More research is needed, but osteohistology has the potential to positively affect the studies in
399:. Their length is often hard to define, but estimates vary from several millimeters to around 1 centimeter. They are present in many bones of most mammals and some bird, reptile, and amphibian species.
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research and in forensic investigations, osteons in a bone fragment can be used to determine the sex of an individual and age, as well as aspects of taxonomy, diet, health and motor history.
411:, the bone-forming cells, secrete the organic components of bone matrix and then initiates its mineralization. As osteoblasts become surrounded by the bone matrix, they differentiate into
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The
Haversian system forms during the process of endochondral ossification, which starts with a cartilage template that is gradually replaced by bone tissue.
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Pfeiffer, Susan; Crowder, Christian; Harrington, Lesley; Brown, Michael (2006). "Secondary osteon and haversian canal dimensions as behavioral indicators".
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that surround a central canal, the
Haversian canal. The Haversian canal contains the bone's blood supplies. The boundary of an osteon is the
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Chinsamy, Anusuya (1995). "Ontogenetic
Changes in the Bone Histology of the Late Jurassic Ornithopod 'Dryosaurus Lettowvorbecki'".
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Cooper, Reginald R.; Milgram, James W.; Robinson, Robert A. (1966). "Morphology of the Osteon: An
Electron Microscopic Study".
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Martiniaková, Monika; Omelka, Radoslav; Grosskopf, Birgit; Sirotkin, Alexander V.; Chrenek, Peter (2008).
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415:, which reside in the lacunae and maintain bone tissue. The osteocytes connect to each other and the
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702:"Sex-related variation in compact bone microstructure of the femoral diaphysis in juvenile rabbits"
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789:. Faculty of Natural Sciences, Constantine the Philosopher University in Nitra: Nitra, Slovakia
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Diagram of a typical long bone showing both compact (cortical) and cancellous (spongy) bone.
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Robling, Alexander D.; Stout, Sam D. (1999). "Morphology or the
Drifting Osteon".
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processes of their counterparts via a network of small transverse canals, or
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The athletic horse : principles and practice of equine sports medicine
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Diagram of compact bone from a transverse section of a long bone's cortex.
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Reid, R. E. H. (1984). "Primary Bone and
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Musculature system: anatomy, physiology, and metabolic disorders
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617:Patterson, Janet C.; Firth, Elwyn C. (2013-06-06).
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101:. Unsourced material may be challenged and removed.
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907:. Summit, New Jersey: Chiba-Geiger Corporation
926:http://www.trinity.edu/stonily/bone/intro2.htm
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441:Each osteon consists of concentric layers, or
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623:(Second ed.). Elsevier Health Sciences.
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391:) is the fundamental functional unit of much
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27:Fundamental anatomical unit of compact bone
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461:. Osteocytes make contact with the
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647:(2009); retrieved 23 June 2009.
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490:during the process of
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308:Anatomical terminology
1021:fibrocartilage callus
924:SLIBS Bone Website:
484:interstitial lamellae
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659:Cells Tissues Organs
95:improve this article
840:1984GeoM..121..589R
828:Geological Magazine
447:compact bone tissue
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592:. Thieme. p.
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1299:bone marrow
1039:chondrocyte
712:(1): 15ff.
463:cytoplasmic
451:cement line
409:Osteoblasts
278:Identifiers
205:introducing
1289:trabeculae
1284:canaliculi
1262:periosteum
1221:epicondyle
1206:metaphysis
1166:cancellous
1124:osteoclast
1114:osteoblast
1026:metaphysis
643:"Osteon,"
569:References
499:periosteum
467:canaliculi
422:canaliculi
413:osteocytes
188:references
121:newspapers
50:improve it
1330:irregular
1257:endosteum
1230:Structure
1211:diaphysis
1192:epiphysis
1119:osteocyte
1008:Cartilage
1000:cartilage
856:128981835
475:metabolic
471:nutrients
429:Structure
342:osteology
56:talk page
1354:Category
1335:sesamoid
1274:enthesis
1171:cortical
954:Archived
929:Archived
903:(1987),
773:16685724
738:18522730
687:11335682
679:10436327
550:See also
488:resorbed
479:Collagen
443:lamellae
397:diameter
110:"Osteon"
1279:lacunae
1216:condyle
1180:Regions
1150:osteoid
1059:fibrous
1054:elastic
1049:hyaline
958:YouTube
894:5921783
836:Bibcode
729:2435232
477:waste.
301:D006253
273:Details
201:improve
135:scholar
1308:Shapes
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1145:ossein
1133:Matrix
1045:Types
1030:Cells
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284:Latin
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