Apo vhiki makumi maviri nemaviri ekuberekwa kuitika, maitiro emucheche anenge anenge akafanana nehutano hwomwana mushure mekuberekwa. Anotova nezvose zviri mukati uye maitiro, uye mune ramangwana chete kukura kwavo uye kukura kuchaitika. Uye saka vhiki makumi maviri nemaviri - nguva yekuguma kwechipiri chekuongorora maitiro e - ultrasound - chidzidzo umo nhengo dzose dze fetus dzinoongororwa kuvepo kwekuzvarwa kwekusagadzikana.
Vhiki yeKubata 21 - kukura kwe fetus
Pamasvondo makumi maviri nemashanu ekuberekwa, uremu uye chiyero che fetus hazviwanzi kuyerwa nekuongorora - izvi zviratidzo zvisingadzidzisi, kunyange zvazvo urefu hwemuviri hunosvika 18 cm uye uremu hunosvika 300 g.
Kusvikira panguva iyoyo, mukadzi anofanira kunzwa musangano we fetal , kana pavhiki makumi maviri nemaviri vasati vasvika - izvi zvinogona kuva chikonzero chekufunganya.
Svondo 21 - Kuyera kwekuyera kwe fetus
Pamasvondo makumi maviri nemashanu, maererano neprotocol, inenge yose mapfupa, nhengo dzomukati uye hukuru hwakakura hwomukomana hunoyerwa. Chokutanga chekuberekwa kwema fetal muvhiki 21 ibiparietal (51.6 mm pakati pemapfupa maviri epakati), chiyero chechipiri cheganga chiri mberi-parietal (64 mm), asi chimiro cheuropi chakafanana nechechecheche.
Pavhiki 21, mapfupa ese anoputika anoyera, apo:
- kureba kwehudyu - 35.3 mm;
- kureba kwemvura - 33.5 mm;
- kureba kwechibia - 31.7 mm;
- kureba kwemafupa echomuputika 29.5 mm.
Kureba kwechifukidzo pamasvondo makumi maviri nemakumi maviri nematanhatu, 46.4 mm, iyo fetal heart size is 21.2 mm in diameter, 21,5 mm murefu, pane dzose dzemakamuri emwoyo, kutengesa kwaro, uye nguva ye 120-160 paminiti.
Ivhareji yepamukati pamasvondo makumi maviri nemashanu, 52.5 mm, dumbu rinoratidzika pachena, maronda omukati haatombedzereri, rusvingo rwemapapiro rwemuviri rudumbu rwakakwana.
Zvose mafungiro anoonekwa kusvika ku20.3 mm kureba, 11.1 mm kumativi ose, midziyo nemapapiro hazvidi kuwedzera, chironda chiri chiduku, chiri mumatavi maduku, mushure mekusveta fetus, inenge isingaoneki.
Fetus pavhiki 21 yekuzvitakura
Nzvimbo ye fetus inowanzova musoro, asi kunyange kana iyo inobwinya, panguva ino mwana anogona kutendeuka mukati mezuva mumuberekwa, uye naizvozvo, kusvikira vhiki makumi matatu nematatu ekuzvimba, hazvifananidzi kunetseka pamusoro payo.
Iyo placenta iine yunifomu, 25.6 mm yakakura, kuoma kwekamuri ye amniotic fluid munzvimbo isina mahwendefa emucheche inobva 35 kusvika 70 mm. Muchivharo chakavharwa panguva ino.