![Lub neural raj tsim theem twg? Lub neural raj tsim theem twg?](https://i.answers-medical.com/preview/medical-health/14062209-what-stage-does-the-neural-tube-form-j.webp)
Video: Lub neural raj tsim theem twg?
![Video: Lub neural raj tsim theem twg? Video: Lub neural raj tsim theem twg?](https://i.ytimg.com/vi/eC-BqRpEFkk/hqdefault.jpg)
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Nruab nrab ntawm 17th thiab 30th hnub tom qab xeeb menyuam (lossis 4 txog 6 lub lis piam tom qab thawj hnub ntawm tus poj niam = lub cev ntas zaum kawg), neural tube cov ntaub ntawv nyob rau hauv lub embryo (tus me nyuam loj hlob) thiab ces kaw. Cov cev neur tom qab dhau los ua tus menyuam = s tus txha caj qaum, qaum, hlwb, thiab pob txha taub hau.
Ib yam li ntawd, koj tuaj yeem nug, dab tsi yog qhov neural tube?
Cov cev neur yog lub primordium ntawm lub hlwb thiab qaum qaum, thiab cov txheej txheem ntawm nws tsim yog hu ua neurulation.
Ib yam nkaus, dab tsi ua rau nce lub paj hlwb? Hauv vertebrates cev neur lies tam sim ntawd saum lub notochord thiab extends tshaj nws anterior ntsis. Cov cev neur yog lub rudiment ntawm lub hlwb thiab tus txha caj qaum; nws lumen muab sawv mus rau kab noj hniav, lossis lub ntsws, ntawm lub hlwb thiab mus rau …… thiab fuse, yog li tsim ib qho cev neur.
Yog li ntawd, txheej txheej kab mob dab tsi yog cov hlab neural tsim los ntawm?
ectoderm
Thaum twg theem ntawm embryonic txoj kev loj hlob puas lub neural raj tsim?
Neurulation yog txheej txheem ntawm kev tsim cov hlab neural, uas yuav dhau los ua lub hlwb thiab tus txha caj qaum. Hauv tib neeg, nws pib nyob rau lub lim tiam thib 3 tom qab fertilization thiab xav kom cov khaubncaws sab nraud povtseg ntawm embryonic kab mob disc elevate li folds thiab fuse nyob rau hauv nruab nrab.
Pom zoo:
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Hauv lub neej voj voog ntawm kev sib deev kis tus kab mob hu ua fungus, theem haploid hloov nrog qib diploid. The haploid theem xaus nrog nuclear fusion, thiab theem diploid pib nrog kev tsim zygote (diploid cell ua los ntawm fusion ntawm ob haploid cells)
Lub zais pa sawv cev dab tsi lub raj mis sawv cev yog lub zais pa sab hauv lossis sab nraum lub raj mis?
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Utricle thiab saccule yog ob lub cev otolith nyob rau hauv pob ntseg sab hauv. Lawv yog ib feem ntawm qhov sib npaug (cov labyrinth membranous) hauv lub vestibule ntawm lub pob zeb labyrinth (chav me me oval). Lawv siv cov pob zeb me me thiab cov kua nplaum nplaum los txhawb cov plaub hau kom pom kev txav thiab kev taw qhia
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Ib hom kev pub mis tuaj yeem muab los ntawm lub raj tso rau hauv lub qhov ntswg mus rau hauv lub plab lossis lub plab, hu ua Nasoenteric Feeding thiab suav nrog naso gastric (NG), naso duodenal thiab naso jejunal (NJ) noj
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Endotracheal intubation yog txheej txheem uas lub raj tso rau hauv lub qhov ncauj mus rau hauv lub qhov ncauj (txoj hlab pa loj ntawm lub qhov ncauj mus rau lub ntsws)