2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Lub extraembryonic mesoderm ntawm chorion, chorionic villi, thiab lub cev stalk originates nyob rau hauv lub caudal margin ntawm lub primitive streak primitive streak Lub primitive streak yog a qauv uas tsim nyob rau hauv lub blastula thaum lub sij hawm thaum ntxov ntawm avian, tsiaj reptilian thiab mammalian embryonic txoj kev loj hlob. Nws ua rau ntawm lub dorsal (rov qab) lub ntsej muag ntawm lub embryo tsim, mus rau lub caudal los yog posterior kawg. https://en.wikipedia.org › wiki › Primitive_streak
Primitive streak - Wikipedia
uas txhim kho hauv 12- rau 14-hnub tib neeg thiab macaque embryos. Tsim nyob rau hnub 8 hauv tib neeg. Hnub 12 ntawm tib neeg txoj kev loj hlob, lub extraembryonic mesoderm splits los ua chorionic kab noj hniav.
Yuav ua li cas extraembryonic mesoderm tsim?
Lub extraembryonic mesoderm nyob rau hauv tib neeg embryos ntseeg tau tsim los ntawm lub hypoblast(txawm hais tias trophoblast contribution kuj plausible), thaum nyob rau hauv nas, nws tshwm sim los ntawm caudal kawg ntawm lub primitive. streak.
Lub sijhawm mesoderm ua li cas?
Definition. Mesoderm yog ib qho ntawm peb txheej txheej kab mob uas tshwm sim hauv lub lim tiam thib peb ntawm kev loj hlob embryonic. Nws yog tsim los ntawm cov txheej txheem hu ua gastrulation.
Dab tsi yog qhov extraembryonic somatic mesoderm ua?
Somatic txheej ntawm extraembryonic mesoderm tsim nyob ib sab ntawm cytotrophoblast. Ua ke lawv tsim the somatopleure.
Hnub twg cov kab mob amniotic tshwm sim?
Abpib ntawm lub lim tiam thib ob, kab noj hniav tshwm nyob rau hauv lub cell loj, thiab thaum nws loj tuaj, nws dhau los ua cov kab noj hniav amniotic. Hauv pem teb ntawm amniotic kab noj hniav yog tsim los ntawm cov epiblast. Epiblast tsiv nruab nrab ntawm cov epiblastic disc thiab trophoblast.
Pom zoo:
Thaum twg tsim nyog tsim nyog?
Evan Edward Tsim Nyog Early College High School yog ib lub tsev kawm ntawv theem nrab nyob hauv cheeb tsam Sunnyside ntawm Houston, Texas, Tebchaws Meskas. Tsim nyog pab rau qib 9 txog 12 thiab yog ib feem ntawm Houston Independent School District.
Thaum twg cov kab mob extraembryonic tshwm sim thawj zaug?
-Thawj tshwm sim lig hnub 3 raws li kev txuas ntxiv ntawm hindgut thiab txhim kho ntawm chorion thiab amnion. Lub lim tiam twg ua rau cov kab mob extraembryonic tsim? Lub sijhawm lub lim tiam thib peb, cov kab mob primordial, uas tshwm sim hauv extraembryonic mesoderm ze ntawm lub hauv paus ntawm allantois, ua kom pom tau hauv ob sab ntawm lub hnab yolk (saib daim duab.
Nyob rau hauv cov ntaub so ntswg extraembryonic puas tshwm sim hematopoiesis?
In the mesoderm txheej yog cov yolk sac blood islands blood islands Blood islands yog structures nyob ib ncig ntawm lub embryo tsim uas ua rau ntau qhov sib txawv ntawm cov hlab ntsha.. Ntshav cov Islands tuaj tshwm rau sab nraud rau kev loj hlob embryo nyob rau hauv lub plab vesicle, allantois, txuas stalk thiab chorion.
Extraembryonic mesoderm tuaj qhov twg?
Lub extraembryonic mesoderm nyob rau hauv tib neeg embryos ntseeg tau tsim los ntawm the hypoblast hypoblast Endoderm progenitor cells ua rau lub plab hnyuv thiab mus rau tag nrho cov ntaub so ntswg endoderm. Hauv kev txhim kho nas, cov hlwb no tshwm sim nyob rau hauv anterior primitive streak (nruab nrab mus rau lig streak) thiab posterior epiblast (pre thiab ntxov streak).
Thaum twg siv tsim nyog thiab tsim nyog?
3 Teb. Teem caij tam sim no: Nws tsim nyog tau them. Yav dhau los: Nws tsim nyog tau them. Tsim nyog yog VERB uas txhais tau tias tsim nyog lossis tsim nyog, lossis haum rau qee yam, feem ntau yog nqi zog lossis kev rau txim. Koj siv li cas tsim nyog thiab tsim nyog hauv kab lus?
