Cov pob txha alveolar, tseem hu ua txheej txheem alveolar, yog feem ntawm lub puab tsaig uas tuav cov hniav. Cov pob txha ntawm no txhawb cov cag ntawm cov hniav thiab ua kom lawv nyob hauv qhov chaw.
Puas yog pob txha alveolar puas yog pob txha cortical?
Cov pob txha txhawb nqa alveolar muaj ob leeg pob txha cortical thiab trabecular. Cov pob txha cortical, tseem hu ua cortical daim hlau, muaj cov phaj ntawm cov pob txha pob txha pom ntawm lub ntsej muag thiab lub ntsej muag ntawm cov pob txha alveolar.
Lub hom phiaj ntawm pob txha alveolar yog dab tsi?
Alveolar pob txha yog ib feem ntawm lub maxilla thiab mandible uas txhawb cov hniav los ntawm kev tsim "lwm" txuas rau fibers ntawm lub paj hlwb(Fig. 1.148).
Yuav ua li cas yog pob txha alveolar raug txheeb xyuas raws li hauv duab hluav taws xob?
Cov pob txha alveolar tsim nyog kuj tseem hu ua pob txha pob vim yog Sharpey fibers, ib feem ntawm cov fibers uas tsim PDL, muaj nyob ntawm no. Zoo ib yam li cov cemental nto, Sharpey fibers nyob rau hauv cov pob txha alveolar raug muab tso rau ntawm lub kaum sab xis lossis ntawm 90 degrees.
Puas yog pob txha alveolar woven?
Cov pob txha alveolar pib thawj zaug los ntawm kev siv tshuaj intramembranous ossification nrog rau hauv ectomesenchyme ib puag ncig cov hniav tsim. Cov pob txha thawj zaug no yog hu ua woven pob txha tsis tshua muaj kev sib koom thiab tau hloov nrog ntau hom lamellar ib qho. Thaum tus hniav deciduous los, nws cov pob txha alveolar yog resorbed.
