Qhov sib txawv tseem ceeb ntawm cov pob txha pob txha thiab cov pob txha tshem tawm yog lawv cov qauv. Cov pob txha pob txha yog cov tawv tawv sab nraud ntawm cov pob txha thaum cov pob txha tshem tawm yog cov pob txha sab hauv, cov txheej txheem tsawg ntawm cov pob txha.
Cov pob txha yog cov khoom tseem ceeb hauv kev pab txav thiab muab lub cev rau lub cev. Cov pob txha yog cov khoom ntawm lub cev pob txha. Tib neeg lub cev pob txha yog tsim los ntawm 206 pob txha. Feem ntau, tib neeg lub cev pob txha muaj ob lub ntsiab sib faib thaum loj hlob (mus txog qhov siab tshaj plaws); axial thiab appendicular skeleton. Sib nrug los ntawm kev txhawb nqa kev txav mus los thiab muab cov duab zoo rau lub cev, lub cev pob txha kuj tseem muaj kev tiv thaiv, tsim cov qe ntshav, khaws cov ntxhia hauv lub cev thiab kev tswj hwm endocrine. Cov pob txha pob txha thiab kev tshem tawm yog ob hom pob txha muaj nyob hauv cov pob txha.
Cov pob txha loj yog dab tsi?
Cov pob txha pob txha yog lub cylindrical nyuaj txheej txheej ntawm cov pob txha. Hauv lwm lo lus, lawv yog cov pob txha cortical; cov pob txha ntom thiab muaj zog tshaj plaws hauv lub cev. Rau kev noj qab haus huv ntawm cov pob txha, cov pob txha pob txha muaj cov kab me me rau cov hlab ntsha thiab cov hlab ntsha. Cov pob txha pob txha muaj cov pob txha daj feem ntau rau kev khaws cov rog.
Ntxiv mus, periosteum thiab endosteum npog cov pob txha pob txha los ntawm sab nraud thiab sab hauv sab. Lub endosteum yog nyias cov ntaub so ntswg. Tsis tas li ntawd, cov kab noj hniav ntawm cov pob txha ntev yog lined los ntawm endosteum.
Nyob hauv cov pob txha pob txha, cov ntaub so ntswg ua rau osteocytes. Ib tug khoom extracellular matrix nyob ib ncig ntawm cov osteocytes. Lub matrix muaj hydroxyapatite, uas yog ib tug compound nplua nuj nyob rau hauv calcium thiab phosphorus. Nyob rau hauv lub hydroxyapatite matrix, collagen fibers interspersed. Cov qauv no muab kev yooj yim rau cov pob txha compact.
Daim duab 01: Pob txha pob txha
Cov pob txha pob txha yog tsim los ntawm osteons, uas yog cov txheej txheem tseem ceeb ntawm cov pob txha pob txha. Cov kwj dej me me nyob ib puag ncig cov osteons. Nyob rau hauv tus txheej txheem ntawm fetal txoj kev loj hlob, osteogenic hlwb (osteocytes) secrete cov pob txha matrix. Yog li ntawd, lacuna yog kab noj hniav uas muaj cov osteocytes. Ntxiv mus, lub network ntawm cov kwj dej me me hu ua canaliculi muab cov pa oxygen thiab cov as-ham rau cov osteocytes.
Cov pob txha Cancellous yog dab tsi?
Cancellous pob txha, tseem hu ua spongy pob txha yog lub cuboidal, puab, ntxeem tau, tsawg ntom, osseous cov ntaub so ntswg pom nyob rau hauv nruab nrab cheeb tsam ntawm cov pob txha. Cov pob txha Cancellous muaj nyob rau sab hauv ntawm cov pob txha ntev. Nyob rau hauv kev sib piv rau cov pob txha compact, cov pob txha cancellous yog tsawg ntom thiab sib zog. Lawv cov matrix muaj trabeculae; ntxhia tuav uas npaj ib lub latticework ntawm peb seem. Tsis tas li ntawd, cov pob txha liab thiab cov hlab ntsha tuaj yeem ua rau qhov chaw ntawm 3D lattice. Cov chaw no muaj kev sib tshuam los ntawm canaliculi.
Daim duab 02: Cov pob txha rho tawm
Dhau li ntawm, qhov loj ntawm cov pob txha ntev feem ntau muaj cov pob txha tshem tawm. Cov qauv kawg no yog epiphyses. Kev tiv thaiv yog lub luag haujlwm tseem ceeb ntawm epiphyses. Epiphyses muaj nyob rau hauv cov pob txha tiaj tus ntawm pob txha taub hau, tav, lub xub pwg hniav, thiab lwm yam. Feem ntau ntawm cov pob txha tiaj tus ntawm cov pob txha yog tsim los ntawm cov pob txha tshem tawm.
Ntxiv mus, cov pob txha tshem tawm muaj kev ua haujlwm siab ntawm cov metabolism. Vim yog kev ua ntawm osteoblasts, cov pob txha pob txha tuaj yeem hloov mus rau cov pob txha pob txha. Raws li, ib qho ntawm cov haujlwm tseem ceeb uas ua los ntawm cov pob txha tshem tawm yog kev tsim cov qe ntshav liab (hematopoiesis). Nws tshwm sim hauv cov pob txha liab ntawm cov pob txha tshem tawm.
Dab tsi yog qhov zoo sib xws ntawm Cov pob txha pob txha thiab pob txha?
- pob txha pob txha thiab pob txha tshem tawm yog ob hom pob txha.
- Ob leeg yog tsim los ntawm osseous
- Kuj, ob leeg muaj calcium.
- Tsis tas li ntawd, lub luag haujlwm tseem ceeb ntawm ob hom pob txha yog kev pab hauv kev txav ntawm lub cev.
Dab tsi yog qhov sib txawv ntawm cov pob txha pob txha?
Thaum xav txog cov pob txha ntev, muaj ob thaj chaw tseem ceeb ntawm nws. Cov pob txha pob txha yog cov pob txha sab nraud cylindrical nyuaj. Cov pob txha Cancellous yog cov pob txha mos hauv pob txha pob txha. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm cov pob txha pob txha thiab cov pob txha. Tsis tas li ntawd, cov pob txha pob txha muaj ntau dua 80% ntawm cov pob txha pob txha thiab tsuas yog 20% ntawm cov pob txha spongy. Li no, qhov no kuj yog qhov sib txawv ntawm cov pob txha pob txha thiab pob txha.
Tsis tas li, qhov sib txawv ntxiv ntawm cov pob txha pob txha thiab cov pob txha tshem tawm yog tias cov pob txha pob txha muaj cov calcium ntau ntau piv rau cov pob txha pob txha. Yog li ntawd, cov pob txha compact yog nyuaj thiab tuab heev piv rau cov pob txha tshem tawm. Tsis tas li ntawd, cov pob txha pob txha muaj cov pob txha daj daj thiab koom nrog hauv cov roj cia. Ntawm qhov tod tes, cov pob txha tshem tawm muaj cov pob txha liab thiab koom nrog hauv cov qe ntshav liab. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm cov pob txha pob txha thiab cov pob txha tshem tawm.
Cov infographic hauv qab no qhia ntau qhov tseeb ntawm qhov sib txawv ntawm cov pob txha pob txha thiab cov pob txha.
Summary – Compact vs Cancellous Bone
Cov pob txha pob txha pob txha thiab pob txha tshem tawm yog ob hom pob txha. Hauv cov ntsiab lus ntawm qhov sib txawv ntawm cov pob txha pob txha thiab cov pob txha, cov pob txha pob txha yog cov cylindrical nyuaj txheej txheej ntawm cov pob txha. Lawv yog tsim los ntawm osteons, thiab lawv muaj cov calcium ntau ntau. Ntawm qhov tod tes, cov pob txha tshem tawm yog qhov cuboidal puab ntxeem tau, tsis tshua muaj ntom, cov ntaub so ntswg pom nyob rau hauv nruab nrab cheeb tsam ntawm cov pob txha. Tsis tas li ntawd, lawv yog cov pob txha mos thiab muaj ntau qhov chaw hauv lawv. Tsis tas li ntawd, cov pob txha compact tshwm sim nyob rau sab nrauv thiab cov pob txha tshem tawm tshwm sim nyob rau hauv nruab nrab thaj tsam ntawm cov pob txha ntev. Tsis tas li ntawd, cov pob txha pob txha suav rau 80% ntawm cov pob txha hnyav thaum tus so nyob ntawm cov pob txha tshem tawm.
