Anthu chitukuko embryonic

Development wa mwana wosabadwayo m'mimba ya mkazi imakhala nthawi zitatu.

Magawo chitukuko embryonic.

Nthawi yoyamba pamene wayamba malowedwe mu uterine M'mimbamo wa linagwira ndi kukupitirirabe sabata loyamba. Panthawi imeneyi embryonic chitukuko cha munthu chikuphatikizapo ziwalo chachikulu Bookmark, mapangidwe machitidwe extraembryonic kuti kenako kuonetsetsa kuti kuli mwana wosabadwayo maphunziro zonse kachitidwe onse ndi ziwalo.

Pakuti fixation chachikulu chiberekero cha linagwira ndi kukhala yogwira kukula. zigawo selo anapanga - maziko umene ziwalo adzakhala anapanga ina. Mphamvu dzira afika ndi Kutha maselo mu endometrium pamwamba maselo embryonic. Choncho, mwana wosabadwayo ikuyenda zambiri M'mimbamo ndi wotetezedwa m'menemo. Full inalowa zambiri Wamaliza pa tsiku khumi pambuyo umuna.

Komanso, misa selo imayamba kuonjezera kwambiri, izo anapatukana mu mapepala awiri: mkati (endoderm) ndi wakunja (ectoderm) embryonic tsamba. Pambuyo Msabata lachitatu la gestation anapanga mesoderm - lachitatu tsamba lili pakati pa zina ziwiri. Kukula kwa mwana wosabadwayo anthu, makamaka ziwalo zake mkati motero zidzachitika kwa izi zigawo nyongolosi.

The ectoderm ndi maziko mapangidwe enamel mano, zigawo chapamwamba khungu, zotumphukira (mfundo) ndi chapakati (ubongo ndi msana) mantha dongosolo. Komanso anaika ndi mphamvu (kupenya ndi kumva, m'madera olfactory ndi gustatory cha thupi).

Lamkati maselo (endoderm) ndi maziko mapangidwe machitidwe kupuma ndi m'mimba.

Mesoderm nawo mapangidwe minofu ndi mafupa a, mtima, excretory, ndi kachitidwe ubereki.

Embryonic chitukuko mu nthawi yoyamba zikuphatikizapo kugawa maselo a munthu. Mmodzi wa iwo imagwiritsidwa chorion - pulayimale yoopsa zimagwira ntchito zosiyanasiyana. Chorion villi yokutidwa ndi ang'ono kuti kenako kukula mu akalowa la chiberekero ndipo potero kupanga latuluka. mbali ina ya chipindacho nawo chilengedwe cha ziwalo extraembryonic.

Embryonic chitukuko cha chimachititsanso anthu mu gawo lachiwiri la sabata chachiwiri. Likutchedwa nthawi embryonic. Pitirizani stepi ino patatha miyezi iwiri gestation. Nthawi imeneyi, pali mapangidwe ziwalo zonse zofunika.

Panthawi imeneyi komanso kupanga mitsempha yaikulu. Ku dera mutu wa maselo a kathupi kusamukira ku gawo pakati pa mkati ndi kunja maselo. Chifukwa ndi nyongolosi poyambira.

Zikusonyezanso kwa nthawi yachiwiri ndi mapangidwe a latuluka kuchokera chorion lapansi.

Kuyambira sabata chinayi mimba mpaka mwana wabadwa otsiriza lachitatu - yoopsa - nyengo. Anthu embryonic chitukuko pa nthawi imeneyi amakhala ndi kukwaniritsa kukhwima kwa onse nyumba thupi anapanga.

Kuyambira sabata chinayi anayamba dongosolo endocrine. An kupanga itakula mahomoni zofunika kukula. Makamaka kwambiri ndi insulin. Kumapeto kwa mwezi wachitatu umatha ndi kusasitsa wa latuluka, amene nawonso ayamba kutulutsa mahomoni yake.

Kupita chitukuko cha m'madipatimenti ubongo okhwima omwe mukugwira nawo kayendedwe woyamba wa mwana wosabadwayo.

chitetezo maphunziro itha sabata chakhumi ndi chisanu ndi chitatu cha chitukuko yoopsa. thupi mwana imayendetsa maselo oyera kukhala. Yopangidwa ndi mbali amapanga titadziwa chitetezo wa mwana wosabadwayo - interferon ndi immunoglobulin. Ndulu wayamba ntchito.

The kusintha chofunika kwambiri dongosolo m'mapapo mwanga zimachitika pa sabata twente-chachinayi. Ndimapanga m'mapaketi osachiritsika amene amakhala zotheka kuti achite mpweya.

M'mwezi wachisanu ndi chiwiri wa gestation pali kukula kwa minofu ndi mafupa a thupi, kotero kuti thupi mwana akufikira kuposa mutu wake.

Mwezi chinayi wa yogwira kunenepa amapezeka. Mwana nthawi imeneyi amakhala zonse akuti ndi okhwima.