Lub sijhawm embryonic, thaum lub sijhawm organogenesis tshwm sim, tshwm sim nruab nrab implantation ntawm ib ncig ntawm 14 hnub mus rau ib ncig ntawm 60 hnub postconception. Qhov no feem ntau yog lub sijhawm rhiab tshaj plaws rau teratogenesis thaum raug tus neeg sawv cev teratogenic muaj qhov ua tau zoo tshaj plaws ntawm kev tsim cov malformation.
Nyob rau theem twg yog qhov tsim embryo tshaj plaws rau teratogens?
Thaum tus menyuam loj hlob tuaj, muaj qee yam kabmob ua rau qee lub sijhawm. Yog tias teratogen muaj peev xwm cuam tshuam nrog kev kaw lub raj neural, piv txwv li, qhov raug rau teratogen yuav tsum tshwm sim hauv thawj 3.5 txog 4.5 lub lis piam ntawm cev xeeb tub, vim qhov no yog thaum lub neural tube kaw.
Lub sijhawm cev xeeb tub yog cov tshuaj teratogens txaus ntshai tshaj plaws?
Lub Sijhawm nthuav tawm: Teratogens muaj teeb meem tshaj plaws thaum cev xeeb tub, pib kwv yees li 10 mus rau 14 hnub tom qab xeeb tub mus txog 8 lub lis piam mus rau cev xeeb tub.
theem twg ntawm kev loj hlob feem ntau yuav raug kev txom nyem tshaj plaws los ntawm teratogens?
Lub embryo yog qhov muaj feem cuam tshuam rau cov neeg ua haujlwm teratogenic thaum lub sijhawm sijhawm sib txawv sai. Cov theem ntawm kev loj hlob ntawm lub embryo txiav txim siab suscep- tibility rau teratogens. Lub sijhawm tseem ceeb tshaj plaws hauv kev loj hlob ntawm lub embryo lossis hauv kev loj hlob ntawm ib lub cev tshwj xeeb yog lub sijhawm sib faib cell ceev.
yog dab tsi4 cov tshuaj teratogens?
Teratogens tau muab faib ua plaub hom: cov neeg ua haujlwm lub cev, cov kab mob metabolic, kis kab mob, thiab thaum kawg, tshuaj thiab tshuaj.
Teratogens
