Whanaketanga fetal: te wāhanga matua

whanaketanga Natal o te tangata - te wā i te hanganga o te whakatō kākano (hua wairakau) ki te whanau o te kukune tino i hanga e he taea waho te wahine kopu.

huaina ana tēnei wā ko te whānautanga. pumau reira 280 ra. Wehewehe i te wāhanga e whai ake nei o te whanaketanga o te kukune:

• te wā tuatahi - āhuatanga e wehewehenga o te hua manu nga wairakau, te hanganga o te blastula me tona implantation i roto i te ararewa o te kōpū. puta kikiritanga te hononga o tohuhema wahine me te tangata, i roto i nei i hanga te whakatō kākano ki te taputapu ira diploid. I roto i tenei take, i whakaritea sex o te tamaiti e te pūira o te parāoa i nga wairakau te hua manu. Hei tauira, ki te kei reira te X-pūira, ka he kotiro, ki te ahau - i taua tamaiti. Ko te atamira kuru tuatahi e wahi i roto i te pūkano. mutu te tukanga ki whakatika implantation o te hua manu wairakau i te matotoru o te kahu mucous o te kōpū, i reira te reira atu haere tona whanaketanga;

• wā embryonic - te hanganga o te ira, me te turanga o ana whekau. Intrauterine whanaketanga fetal i tenei wā ko te tukanga o te gastrulation i roto i nei e hanga e toru paparanga iroriki. I tua atu, kua whakaaturia puritia reira (te kopa whakatakotoria me okana) histo- me organogenesis. kua he waru-wiki kukune te taimaha o e pā ana ki 4 karamu. faaitehia i ia āhuatanga e hanga e ringa me waewae;

• wā fetal - tahi e tupu ake, me te whanaketanga o te ira, i te mohiotia kua rite te hua o te toru o te hapūtanga marama. Ka rite ki whakaaturia i roto i te karihi wheua ossification i hanga, hipoki ki te fluff te te kiri tīmata kia rongo ki te mokowhiti o te kukune, te wahine mana'o ana nekehanga. whanaketanga fetal i tenei wa āhuatanga e tukanga kaha o te tupu, me te kiko pārōnaki.

Ko te atamira whakamutunga ko te tuku. rongo ratou tīmatanga e te tuku o te oxytocin taiki, whakaputaina nei e te repe. Tenei taiaki whakaongaonga uterine uaua, e tika ana ki te pana o te tamaiti ki roto ki nga papatoiake me whanautanga awa.

Me mea te reira e āhuatanga whanaketanga o te kukune i roto i te utero e etahi wā tino i roto i i kitea te kukune te hypersensitivity ki āhuatanga o waho kino. Ko te toru marama tuatahi o te hapūtanga, me te mahi, e rapu tokanga makehe ki te huru o te wahine hapu. I raro i te mana i te wa o ngā āhuatanga taiao kino ake i te mōrea o ngā abnormalities me deformities me te pōauautanga i roto i muri i te tuku ranei.

Me mahara hoki käore te reira e haere tahi whanaketanga fetal e te hanganga o te okana ahurei - te ewe, e taea ana ki te mau tamariki i roto i te kopu. Ko te ara faufaa o whakarite ki te taiao. Ko tōna mahi matua - whai wāhi i roto i te utu hau o te kukune, tona supply o ngā matūkai me te hāora, me te te secretion o hormones e whakarato te akoranga noa o te hapūtanga.