Video: Thaum twg neural tube tsim?
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), cev nef cov ntaub ntawv hauv lub embryo (tsim menyuam) thiab tom qab ntawd kaw. Cov cev nef tom qab dhau los ua tus menyuam = s tus txha caj qaum, qaum, hlwb, thiab pob txha taub hau.
Yog li ntawd, yuav ua li cas neural tube tsim?
Cov neural folds pinch nyob rau hauv nruab nrab ntawm lub embryo thiab fuse ua ke rau daim ntawv cov cev nef . Hauv theem thib ob ntawm cov hlab ntsha, cov hlwb ntawm neural phaj daim ntawv tus qauv zoo li qaum uas txav mus sab hauv lub embryo thiab hollows rau daim ntawv cov cev.
Qhov thib ob, neural tube yog dab tsi? Cov cev nef yog lub hauv paus ntawm lub hlwb thiab tus txha caj qaum, thiab cov txheej txheem ntawm nws tsim tau hu ua neurulation.
txheej txheej kab mob neural tube tsim los ntawm dab tsi?
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Neurulation hauv vertebrates cov txiaj ntsig hauv tsim ntawm cov hlab ntsha neural, uas ua rau nce mus rau ob tus txha nqaj qaum thiab lub hlwb. Neural crest cells kuj tau tsim thaum lub sijhawm neurulation . Neural crest cells tsiv mus deb ntawm cov hlab neural thiab ua rau muaj ntau hom cell, suav nrog cov pigment cells thiab neurons.
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