Mavhiki mashomanana ekutanga ekudzivirira anonyanya kukosha, nokuti munguva ino mwana anowedzera uye anochinja nekukwirira uye kumiganhu. Iko panguva ino iyo yese nhengo dzekutanga uye zvirongwa zvakarongwa uye dzinotanga kuumba.
Yeuka kuti nguva yepamuviri uye "nguva" yechecheche haigoni kuwirirana: yekutanga inogara yakanyanya kudarika yekupedzisira kwevhiki mbiri, kubvira pakutanga kwekuita vana vanochera pamuviri vanotora zuva rokutanga rekupedzisira kuenda kumwedzi. Muchikamu chino, tichaongorora kuti "kubudirira" embryo kwakabudirira sei mumasvondo masere asina simba.
Zvibereko mumavhiki masere - zviyero
Iyo fetus (kana kuti panzvimbo iyo, mucheche, kwenguva iyo) inoratidzika semavhiki masere anovhiringidza? Iyo inowedzera yakafanana nemunhu, kunyange zvazvo mitezo isati yasvika yakazara, uye mushure mishoma unova miswe. Kureba kwechecheche kubva ku coccyx kusvika kumusoro (iyo inonzi koccyx-parietal size, kana KTP) iri 1.5-2 cm. Izvi hazvisi kuparadzira michero. Hungu, uye inorema inenge 3 g.Biparietal ukuru hwembryo musoro 6 mm, uye upamhi hweji yolk is 4.5 mm.
Dzimwe nguva kudzidza kwe ultrasound kunoratidza kuti ukuru hwema fetus pamasvondo masere ekuberekwa hahuenderani nemirairo. Ichi hachisi chikonzero chekutya. Ichokwadi ndechokuti dzimwe nguva kufambira mberi uye kukura kwemuviri wemunhu kunowanikwa spasmodically. Chimwe chikonzero chinokwanisika: kubereka kwasvika pedyo nekuguma kwemwedzi. Uye mune izvozvo, uye pane imwe nyaya mwana anozofanira kutora uye, zvichida, achawana "tsanangudzo".
Kukura kwekutora masvondo 8-9
Pamasvondo manomwe kusvika ku8, fetus haina kutarisa kufanana nemunhu: inenge ichikotama, musoro unonamatira kumucheto. Zvisinei, kusvika kumagumo evhiki yechisere yekutakura uye pakutanga kwepfumbamwe, mutsipa nemutsipa zvinotanga kururamisa. Dumbu uye utumbo zvinotora chimiro chekupedzisira uye chinotora nzvimbo yavo yakagadzikana, ichigadzira chikamu chikuru chemukati. Nokuda kwekugadzirwa kwechifuva, moyo unowedzera zvishoma nezvishoma mukati megwenzi rinouya.
Maoko nemakumbo zvakasiyana zvakasiyana nemumwe. Pachigunzva che fetus pamusi we8 wekuzvitora, unogona kuona ulnar fossa uye wrist, uye pachigadziko - rudiments yeminwe. Kwapera nguva pfupi, minwe ichaumba, uye micheche pakati pavo ichapera. Makumbo haachinje zvakadaro. Maumbirwo uye kukura kwemasimba, mapfupa uye cartilage iri mukuzara.
Musoro wepamuviri yevanhu pamasvondo masere inenge hafu iyo yose yakareba. Kuumbwa kwechiso kunotanga. Ikopa yeziso iri yakavharwa nerima iris, iyo retina inoumbwa. Iro branchial arch inotanga kuchinjwa kuva mitsetse yepamusoro uye yakaderera. Iko ikozvino inogona kugoneka kusiyanisa mitsara yemutsotsi. Izvo zvinyorwa zvevashandi zviri pasi, asi munguva pfupi vanozotora nzvimbo yavo "yepamutemo".
Mutsara wemadziro uye placenta zviri kuwedzera - hukama pakati peamai nemwana. Mumadziro e-yolk sac, mazamu ekutanga zvepabonde anoonekwa. Pamwe chete neropa vanoendeswa kune zvinyorwa zvezvipembenene zvepabonde. Yakagadzirwa nemagadzirirwo emagetsi, asi zvisati zvisingakwanisi kugona kurara kwomwana.
Izvo chirwere chetsitsi chinoramba chichikura, kunyanya uropi huri kukura zvakasimba. Hazvina mhosva kuti zvakaoma sei kutenda izvi, mamwe masayendisiti anotaura kuti embryo yave ichirota kwevhiki 7-8. Mukuwedzera, kukura kwe
Ganda remucheche richiri rakatetepa, rakajeka. Kuburikidza nayo inoratidzika mitsipa yeropa, uropi uye dzimwe nhengo.
Fetus pavhiki 8 yekuzvitakura - Dambudziko
Kubva mumatambo ekutanga ekudzivirira, zvirongwa zvose zvinokosha uye nhengo dzakaiswa, kukanganisa chero kupi zvako kunogona kutungamirira kumigumisiro inosuruvarisa - kubata kwakanyanya , kupererwa kwepamuviri, kushungurudzwa kwekukura kwe fetus. Ndicho chikonzero zvino zvinokosha kuti uchenjerere: usanwa doro (mune chero uwandu), usasvuta, usatora mushonga kana zvichikwanisika.