Video: Dab tsi yog txheej txheem Notochordal?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Cov notochordal txheej txheem yog mesodermal hollow tube qauv uas nthuav tawm los ntawm cov txheej thaum ub. Pib ntawm txoj kab nruab nrab cranial, lub raj ntev, raws li cov txheej txheem txheej thaum ub txav mus rau qhov kawg ntawm lub raj. Notochordal txheej txheem elongation parallels regression ntawm thawj streak.
Ib yam li ntawd, tib neeg nug, yuav ua li cas thiaj li tsis sib haum?
Hauv qhov cranial, kev tsim kho notochord yog tsim ntawm mesenchymal hws sib sau prechordal phaj uas hloov pauv mus rau hauv notochordal phaj. Caudal rau lub phaj prechordal, tus tsim ntawm qhov tseeb notochord tshwm sim los ntawm tsim ntawm notochordal txheej txheem thiab tseem nyob hauv notochordal phaj.
Ib yam nkaus, Trilaminar disc tsim tau li cas? Gastrulation yog tsim ntawm trilaminar cev xeeb tub daim disk los yog gastrula los ntawm kev tsiv ntawm epiblast cells. Cov kab mob Epiblast tsiv mus los los ntawm cov txheej thaum ub ntawm epiblast thiab hypoblast txheej thiab daim ntawv txheej txheej nruab nrab ntawm cov cell hu ua intraembryonic mesoderm.
Ua qhov no hauv kev txiav txim siab, cov phaj Prechordal dhau los ua dab tsi?
Prechordal Phaj . Cov prechordal phaj muab nce mus rau txheej txheej sab hauv ntawm cov oropharyngeal membrane, uas ua rau lub qhov ncauj qhib, thiab koom nrog hauv kev tsim qauv ntawm cov hlab ntsha cranial.
Dab tsi yog notochord thiab nws ua haujlwm li cas?
Cov notochord yog lub hauv paus ntsiab lus ntawm chordates, thiab muaj lub luag haujlwm tseem ceeb hauv kev txhim kho vertebrate. Nws ua haujlwm los ua qhov chaw nruab nrab ntawm cov cim qhia tias cov qauv ib puag ncig cov ntaub so ntswg thiab ua lub cev pob txha loj ntawm kev tsim cov embryo.
Pom zoo:
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