Ivhareji yenguva yekuzvitakura mazuva 280. Kwemazuva ano ari mudumbu remukadzi kune chiratidzo chechokwadi - kukura kwemuviri wemunhu.
Nhanho dzekuberekwa kwemukomana
1-4 mavhiki. Iyo nzira yekusimudzira embryo inotanga pakarepo mushure mekuberekwa kweii - pakarepo inotanga kuparadzaniswa kwemasero. Ikozvino munguva ino, mwana wemangwana anoiswa nhengo dzose dzinokosha, uye pakuguma kwevhiki rechina mukati maro inotanga kupararira ropa. Hukuru hwembryo hausi yehuyo yejecha.
Vhiki 5-8. Iko mushure memavhiki masere isati wadya kwete kubva kumucheche, asi kubva mumuviri wamai, sezvo yakagadzirwa mumbilical cord uye yakaiswa mumadziro emuviri. Panguva ino, zvikamu zvakakura zvekukura kwebumbiro zvinoitika, zvakakosha zvekunze zviumbwa zviri kushingaira kuumba - musoro, maoko nemakumbo, zvigadziko zveziso, zvinyorwa zvemhino, uye mufananidzo wemuromo. Mwana anotanga kufamba.
Vhiki 9-12. Panguva ino, kukura kwe embryonic embryo kunopera. Uyezve, iyo embryo ichava nezita rokuti "fetus". Mucheche wevanhu wakatove wakanyatsoumbwa nemavhiki gumi nemaviri, masangano ayo ose akagadzirirwa uye achangoramba achikura.
13-24 mavhiki. Kuumbwa kwembryo panguva yechipiri chetatu kunosanganisira kuchinja kwakadaro: ruvara rwemapfupa runova mapfupa, mvere dziripo paganda remusoro uye chiso, nzeve dzinotora nzvimbo yavo yakarurama, misumari inoumbwa, grooves pazvitsitsinho nemichindwe Mwana anonzwa manzwiro pavhiki ye18, pavhiki yekutanga ye 19 maitiro ekugadzirwa kwemafuta anobva pasi anotanga. Iyo embryo ine mazamu kwevhiki makumi maviri. Pamasvondo makumi maviri nemasere, kubatika kwemwana asati aberekwa kunotangwa - uyo anopisa muviri anotanga kubudiswa mumapapu, asingabvumiri mabhokisi epillary kuti apfige panguva yekufema.
25-36 vhiki. Mune rurimi rwemucheche, zvinotapira zvinogadzirwa, zvikamu zvose zvinoramba zvichikura, uropi hunokura nokukurumidza uye hunokura. Kwenguva yekutanga mumavhiki 28, mwana anozarura maziso ake. Kushanda kwekushanda kwemafuta mashomanana, ayo evhiki 36 ndeye 8% yehuwandu huwandu.
37-40 vhiki. Mwana anotora nzvimbo iyo achaberekwa nayo. Kubvira zvino zvichienda, iye akagadzirira hupenyu mumamiriro ekunze.
Zviyero zvemukati nevhiki:
- Vhiki 12 - kukura kwemwana anenge 61 mm, kurema kwayo - 14 g;
- 16 masvondo - 12 cm, 130 g;
- Vhiki makumi maviri - 16 cm, 320 g;
- Vhiki 24 - 21 cm, 630 g;
- Vhiki 28 - 35 cm, 1 kg;
- Vhiki 32 - 40-41 cm, 1600 g;
- 37-40 vhiki - 45 cm, 2500 g;
Mwana wenguva yakazara anoberekwa pamwero wekuwedzera nekuwedzera kwe 51 cm uye uremu - 3400 g.