The Haversian system tau txais nws lub npe los ntawm tus kws kho mob Askiv npe hu ua Clopton Havers (1657-1702), uas paub txog nws qhov kev tshawb fawb thawj zaug rau hauv kev tshuaj ntsuam xyuas cov qauv ntawm cov pob txha thiab pob qij txha. Nws yog thawj tus uas piav txog Charpy fibers.
Lub ntsiab lus
Lub Haversian system, lossis osteons, yog lub hauv paus ua haujlwm ntawm cov pob txha loj heev. Osteons yog cov qauv cylindrical uas feem ntau yog ob peb millimeters ntev thiab txog 0.2 hli inch. Lawv muaj nyob hauv ntau cov pob txha ntawm cov tsiaj nyeg thiab qee hom noog, tsiaj reptiles thiab amphibians.
Histology ntawm cov pob txha compact qhia txog Haversian system
Txhua lub cev muaj cov txheej txheem sib txuam lossis cov phaj ntawm cov pob txha pob txha uas nyob ib puag ncig lub kwj dej hauv nruab nrab. Haversian kwj dej muaj cov ntshav muab rau cov pob txha. Tus ciam teb ntawm osteon yog cov cement kab.
Txhua Haversian channel yog ib puag ncig los ntawm tus lej sib txawv (5-20) concentricallynpaj daim hlau ntawm cov pob txha matrix. Nyob ze ntawm qhov chaw ntawm cov pob txha pob txha yog sib npaug mus rau saum npoo, lawv hu ua daim hlau annular.
Qee cov osteoblasts tsim mus rau hauv osteocytes, txhua tus nyob hauv nws qhov chaw me me lossis lacuna. Osteocytes tuaj rau hauv kev sib cuag nrog cov txheej txheem cytoplasmic ntawm lawv cov neeg sib tw los ntawm kev sib txuas ntawm cov kab me me los yog cov tubules. Lub network no txhawb kev sib pauv ntawm cov as-ham thiab metabolic pov tseg.
Collagen fibers hauv ib lub phaj tshwj xeeb khiav mus rau ib leeg, tab sis kev taw qhia ntawm collagen fibers hauv lwm daim hlau yog oblique. Qhov ntom ntawm collagen fibers yog qis tshaj ntawm cov sutures ntawm lamellas, uas piav qhia txog cov yam ntxwv ntawm cov kab mob sib kis ntawm Haversian systems. Qhov chaw nruab nrab ntawm osteons yog nyob ntawm daim phiaj interstitial, uas yog cov seem ntawm osteons.
Lub Haversian systems tau txuas rau ib leeg thiab mus rau lub periosteum los ntawm oblique kwj dej hu ua Volkmann's kwj dej lossis perforating kwj dej.
Drifting osteons
Drifting osteons yog ib qho tshwm sim uas tsis to taub tag nrho. Ib tug drifting osteon yog cais raws li ib tug Haversian system uas khiav ob leeg longitudinally thiab transversely los ntawm lub cortex. Lub osteon tuaj yeem "drift" nyob rau hauv ib qho kev taw qhia lossis hloov kev taw qhia ob peb zaug, tawm hauv tus Tsov tus tw ntawm lamella tom qab kev nce qib Haversian channel.
Kev tshawb nrhiav siv
Kev tshawb fawb bioarchaeological thiab forensicHauv kev kuaj mob, osteons nyob rau hauv cov pob txha tawg tuaj yeem siv los txiav txim siab tus neeg li poj niam txiv neej thiab hnub nyoog, nrog rau yam ntawm taxonomy, kev noj haus, kev noj qab haus huv, thiab keeb kwm ntawm lub cev muaj zog.
Osteons thiab lawv qhov chaw sib txawv los ntawm taxon, yog li genus thiab hom tuaj yeem sib txawv siv cov pob txha tawg tsis raug txheeb xyuas. Txawm li cas los xij, muaj ntau qhov sib txawv ntawm cov pob txha pob txha sib txawv, thiab cov yam ntxwv ntawm qee qhov faunal osteons sib tshooj nrog tib neeg osteons. Yog li ntawd, txoj kev tshawb no ntawm Haversian systems tsis yog lub ntsiab daim ntawv thov nyob rau hauv kev tsom xam ntawm osteological seem. Kev tshawb fawb ntxiv yog xav tau, tab sis osteohistology tuaj yeem cuam tshuam zoo rau bioarchaeological, paleontological, thiab forensic tshawb fawb.
Nyob rau xyoo tas los no, kev tshawb fawb osteohistological ntawm dinosaur fossils tau siv los daws ntau yam teeb meem xws li dinosaur loj hlob zaus thiab seb nws puas yog tib yam thoob plaws hom, thiab seb dinosaurs puas yog ntshav sov lossis tsis.
