Pakupera kwemavhiki mana chibereko chakakura kusvika 1 mm uye ukuru hwayo ikozvino sembeu yepoppy. Panzvimbo iyi yekukura, fetus kubva kumusana we fetal inotanga kushanduka kuva mucheche. Pave nepamuviri pavhiki 4 kuwanda kwechibereko asiwo zviduku, asi embryo inonzwa inonyanya kuvimba uye zvakanyanya zvakanyatsobatanidzwa kurusvingo rwechibereko.
Kutanga nenguva iyi, mushungurudzo wemavhutura inobudiswa munzvimbo iyo embryo inonamirwa kumusvingo uterine. Izvi zvinoshamwaridzana nevana remangwana namai vake, uye kuburikidza navo haazogadziri zvinhu zvose zvinodiwa muupenyu nehukukura. Apo nguva ye fetus iri masvondo mana, ipapo embryo inotanga kuwedzera humwe hutachiona-nhengo, kupa chikafu chayo, kupumha nekudzivirirwa. Miviri yakadaro inosanganisira:
- Chorion . Inhengo ye embryonic yekunze inokurudzira kusikwa kwepentecenta, iyo yakazara zvakakwana pamagumo evhiki yechigumi nembiri.
- Amnion . Cavity, iyo iyo fetal bladder, inobereka amniotic fluid, iyo imbryo iripo.
- The yolk sac . Kusvikira ava nemakore manomwe kusvika masere, ndiye ane mhosva ye hematopoiesis ye embryo.
Ko fetus inotaridzika sei mumavhiki mana?
Vanhu vazhinji vanoshamisika kuti fetus iri mumavhiki mana sei. Munguva iyi, inoratidzika se diski inoumbwa nematatu masero-majekiti:
- ectoderm (kunze kwekunze), iyo inokonzerwa nokuumbwa kweganda, bvudzi, nervous system, lenzi uye mazino eiri;
- Endoderm (mukati memukati), ane mutoro wekugadzirwa kwemakumbo, chiropa, utachiona uye pancreas;
- mesoderm (pakati pepamusoro), iyo inopedzisira ichishandura kuva masaga, zvinogadzirisa mishonga nemasumbu, ropa uye zvisiri izvo, nhengo dzepabonde.
Kubata kuchaonekwa chete pakuguma kwevhiki, kana kuitwa hCG-kuongorora. Kana iri muedzo weimba, haasi nguva dzose yekuziva nguva yakadaro, nokuti murwizi wemukadzi hauna huwandu hwakawanda hwehomoni.