Video: Dab tsi ua rau txo cov txha hniav laus epithelium?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Cov txo cov txha hniav laus epithelium , qee zaum hu ua txo kho hniav epithelium cov ntaub so ntswg , overlies ib tug tsim hniav thiab yog tsim los ntawm ob txheej: ib txheej ntawm ameloblast hlwb thiab cov nyob ib sab txheej ntawm cuboidal hlwb (sab nrauv txha hniav laus epithelium ) los ntawm cov hniav lamina.
Ua kom pom qhov no, lub cev enamel yog dab tsi?
Cov cog zuv tau teeb tsa ua peb ntu: cov hniav txha hniav laus, cov kho hniav papilla thiab lub hnab hniav los yog follicle . Lub cev txha hniav laus yog tsim los ntawm txheej txheej txha hniav laus sab hauv, sab hauv txha hniav laus epithelium, stellate reticulum thiab stratum intermedium.
Tsis tas li ntawd, dab tsi sab nrauv enamel epithelium ua? 4.4 Txhim kho hniav Ntxiv mus, cov enamel lub cev yog tsim los ntawm sab nrauv enamel epithelium , sab hauv txha hniav laus epithelium , stellate reticulum, thiab stratum intermedium thiab ua rau ameloblasts, uas tsim enamel thiab ua ib feem ntawm qhov txo txha hniav laus epithelium.
Ib yam li ntawd, nws raug nug, tus qauv ntawm cov hniav dab tsi ua rau lub hauv paus enamel epithelium tsim?
Sab hauv txheej txha hniav laus, tseem hu ua txheej txheej sab hauv sab hauv, yog txheej txheej ntawm cov xov tooj cua nyob ntawm ntug uas ze tshaj plaws hniav hniav ntawm lub enamel lub cev nyob rau hauv ib tug txhim kho hniav. Cov txheej no tau pom thawj zaug thaum lub sij hawm lub hau cap, nyob rau hauv uas cov txheej txheem sab hauv txha hniav laus epithelium yog pre-ameloblast cells.
Lub hauv paus hniav txha hniav laus yog dab tsi?
Taw qhia. Enamel , tib neeg cov ntaub so ntswg uas nyuaj tshaj plaws muab cov kev tiv thaiv sab nrauv rau cov hniav. Nws yog tsim los ntawm carbonate hloov hydroxyapatite crystallites. Cov txheej txheem ntawm enamel kev loj hlob hu ua amelogenesis thiab cov cell uas tsim enamel , ameloblasts, yog muab los ntawm qhov ncauj ectoderm.
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