Embryo kukurudzira inzira yakareba, yakaoma uye inofadza. Mushure mekunyanya kweii duku neuviri mumwedzi 9 chete munhu mutsva achazvarwa. Mukukurudzirwa kwaro, mwana wemunguva yemberi achapfuura nepakati pezvikamu zvakasiyana, uye izvo zvinodanwa nguva dzinotambudza zvekuberekwa kwemukomana, uye zvicharamba dzichidaidzwa kuti embryo kana embryo, zvino chibereko, kusvika panguva yekuzvarwa.
Nhanho dzekuberekwa kwemukomana
Kuburikidza kwehutumbi hwemunhu hunotanga kubva panguva yekubata pamuviri, kusanganiswa kwe spermatozoon uye ovum nekuumbwa kwe zygote, iyo mumazuva mashomanana ichapfuura mapoka akasiyana. Pazuva rechina iro rudzi rwema rasipiberi berry mufomu, uye rine ma 58 masero. Kubva aya masero, 5 achadikanwa kuti agadzire pentcenta yeramangwana, chorion uye umbilical cord, iyo inosara 53 - inopa humwe hurikudziridzwa huri fetus.
Kubva pamwedzi wechinomwe kusvikira pa14 kubva panguva yekuumbwa, vanaamai vari mberi vachafanirwa kunyatsongwarira - iyi ndiyo nguva yokutanga inotambudza yekuita pamuviri: nguva yekuiswa kwemukati mumadziro emuviri. Iyo embryo inogona kunge isina kuiswa kune zvikonzero zvakawanda, pakati payo:
- kutsvaga kune zvinokonzera chepfu;
- basa rakasimba remuviri;
- mechanical impact;
- yakadzika masasa;
- hutachiona hwechimiro uye izwi rechibereko.
Kana zvichibudirira kugadziriswa, embryo yakagadzirirwa mudanda re uterine pedyo nepamusoro pemidziyo, iyo ichapa chikafu nekuvandudza.
Kubva pamakore gumi nemasere kusvika kumakumi matatu, fetus inopoteredzwa nemadziro emukati emubereki, uye iri pedyo neyo myometrium. Mune mhaka iyi, envelopu ye embryo inoumba chorionic villi, iyo ichava nheyo yemusana we fetal, chorion uye remangwana mutsara. Panguva ino, kushingaira kwema cell division kunotanga, kuumbwa kwepakutanga-circulatory system, amniotic fluid inoumbwa.
Kubva pamazuva 18-21, apo mwoyo wemukomana unotanga kurova, sarudza kuvepo kwemwana weramangwana pa ultrasound. Izvi zvinoitwa nokuda kwekuona kuberekwa kwakanyanyisa, izvo dzimwe nguva kunowanikwa mumatanho ekutanga ekugadzirwa kwebumbiro uye kunosanganiswa nekushaikwa kwepfungwa dzomukati.
Mwedzi wokutanga wekudzivirira uri kuuya kumagumo (mwedzi nemavhiki mumatambudziko anoverengwa kubva pakupedzisira kuenda kumwedzi, uye mazuva kubva pakuberekwa).
Inotanga vhiki 5-8, mwedzi wechipiri wekudzivirira. Inotaridzirwawo kuti inonyanya kukosha, sezvo nhengo dzose nezvirongwa zviri pasi. Iko munguva ino iyo imwe yenhengo huru dzinogadziriswa inoumbwa - mutsara wembilical, unosanganisira plexus yemaseri uye mitsipa, uye unopa kudya uye kushandiswa kwemagetsi embryo, nepo placenta panguva yekuzvitakura , iyo inogadzira vhiki imwe gare gare, inopindira neropa reamai nevana, uye hematopoietic basa.
Pazuva remakumi maviri nemaviri kubva panguva yekubata pamuviri, kuumbwa kwemakumbo europi nemumutsipa wesimbi, mumatumbo, zvino mazuva mana gare gare maitiro emakumbo anoumbwa-maziso, nzeve, mhino, muromo, muswe unooneka zvakajeka. Kubvira pamwedzi wechipiri wekusimbiswa, embryo inenge yatonzi "fetus". Mune nguva ino, CTE (coccygeal parietal size) ye embryo iri 5-8 mm. Musoro uri pamakona akakwana kusvika kumatombo, maimbwa anokura, mwoyo unoumbwa.
Phiki yechitanhatu, CTE ye embryo inowedzera kusvika pamamiriyoni gumi nemashanu, muswe unonamatira kune trunk. Kutanga kubva kumavhiki manomwe kusvika ku8 - mazino, chigadzirwa chemusishuseki ye embryo chinoumbwa. Mabhesi ari kutenderera, akaonda kwazvo,
Mucheche inowedzera chiso chomunhu, muswe unopera, mitezo inoumbwa. Zvadaro zvinotevera imwe nguva yakaoma, sezvo nhengo dzose dzichangobva kuumbwa dzinopinda mungozi kune chero cheipi inotyisa. Asi fetus haichazonzi embryo. Saka, takatsanangura maitiro ekugadzirwa kwebumbiro rakazara.