Video: Tus txheej txheem txheej txheej txheej thaum ub zoo li cas?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Kev tsim ntawm lub txheej thaum ub Hauv blastocyst suav nrog kev sib koom ua ke ntawm kev txav thiab rov kho cov hlwb hauv epiblast. Cov xov tooj sib tshooj Koller's Sickle nyob rau tom qab kawg ntawm tus me nyuam qaib embryo txav mus rau kab nruab nrab, sib ntsib thiab hloov kev taw qhia mus rau nruab nrab ntawm epiblast.
Yooj yim li ntawd, dab tsi ua ntej streak muab nce rau?
Qhov no thickening, lub txheej thaum ub , muab nce rau notochord thiab rau txheej txheej thib peb, mesoderm. Qhov ntev ntawm lub hauv paus ntawm lub embryo yog thawj zaug tso los ntawm kev tsim cov cylindrical pawg ntawm cov cell, lub notochord, nthuav tawm los ntawm txheej thaum ub (Hensen) node ntawm lub anterior…
Ib qho ntxiv, puas yog cov txheej txheem txheej thaum ub dhau los ua tus notochord? Notochord Kev Txhim Kho notochordal phaj yog thawj qhov kev hloov pauv ntawm cov xovtooj ntawm tes thiab cheeb tsam dag saum toj no txheej thaum ub , uas yuav tom qab ua hloov dua siab tshiab rau hauv notochord . Cov yeeb yaj kiab no qhia txog kev txhim kho thaum ntxov ntawm notochord tshwm sim nyob rau lub lim tiam 3 ntawm tib neeg txoj kev loj hlob.
Ib yam nkaus, cov txheej txheem twg yog qhia los ntawm kev tsim cov txheej thaum ub?
Gastrulation yog kev hloov pauv ntawm epiblast los ntawm bilaminar disc rau hauv trilaminar embryonic disc suav nrog ectoderm, mesoderm, thiab endoderm. Gastrulation pib nrog tsim ntawm cov txheej thaum ub.
Lub primitive node ua dab tsi?
Primitive Node . Cov thawj node yog ib cheeb tsam los ntawm cov migrating hlwb raug xa mus rau hauv ib tug rod zoo li loj mesenchymal hlwb hu ua lub notochord. Nws yog suav tias yog ua tib neeg sib npaug ntawm Spemann-Mangold tus npaj, qhov tshwj xeeb inductive dorsal blastopore di ncauj hauv amphibian embryos.
Pom zoo:
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Cov kauj ruam hauv cov txheej txheem txheej txheem txheej txheem mob yog dab tsi?
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