A makonni 18 zuwa makonni ne aka umarci mace da yin jarrabawa na biyu. Tunda har zuwa makonni 24 kawai, ana iya katse ciki saboda yanayin likita, yana kan binciken na biyu na gwadawa cewa likitoci ya kamata su yi imani da cewa babu wani mummunan cututtuka a cikin yaron. Idan ya cancanta, a wannan lokacin yana yiwuwa a shawo kan gwaje-gwajen shawara a likitoci na likita - don tabbatar da lahani ko cire abin ganewar asali kuma lokaci na ƙarshe don wannan shine makonni 21 na ciki. Wasu lokuta yana iya ɗaukar cewa samfurin dan-Adam 3-D a wannan lokaci zai taimaka wajen gano asali daban-daban, amma nazarin duban dan tayi ya dogara ba kawai akan damar na'urar ba, har ma a kan cancantar likita.
Hanyar duban dan tayi a makonni 21 na gestation
A cikin 20 - 21 makonni na ciki, babban girma ga duban dan tayi ne kamar haka:
- a mako 21, nauyin nauyin tayin yana da 300 g;
- tsawon jiki - har zuwa 16 - 18 cm;
- BDP (girman kwanyar kwanyar kwanyar) - 48.4 - 51.6 mm;
- LTE (adadin kwanyar kwanyar kafa) - 60 - 64 mm;
- DB (tsawon cinya) - 33.1 - 35.3 mm;
- SJ (nufin diamita na ciki) - 49.3 - 52.5 mm;
- SDHK (nufin diamita na kirji) - 43.2 - 46.4 mm;
- kauri daga cikin mahaifa - 25 - 26 mm, kwatankwacin ba tare da haɓaka ba, rashin digiri na balaga;
- Tsakanin shafi na amniotic ruwa daga 35 zuwa 70 mm, ruwan ya zama mai tsabta.
A wannan lokacin, yana da muhimmanci don bincika dukkanin ɗakuna 4 na zuciya da yanayin shafuka, duba tafarkin manyan tasoshin, zuciyar zuciya ta tayi a wannan lokaci - daga 120 zuwa 160 a minti daya, zuciya mai kwakwalwa , ƙungiyoyi masu aiki - ba a kasa da 15 a kowace awa ba.
A wannan lokaci ne mace ta kamata ta ji motsin farko na tayin, amma har yanzu suna da rauni da rashin bin doka, amma a kan duban dan tayi. Matsayin tayin a cikin mahaifa ya kasance marar ƙarfi - yayin rana, yana iya sauyawa kamar yadda kake so. Sakamakon duban dan tayi, lokacin da makonni 21 na ciki ya fara, ya kamata ya hada da ma'auni na tsarin kwakwalwa ɗaya: ventricles na kwakwalwa, da cerebellum, babban ramuka. Tabbatar tabbatar da tsawon dukan kasusuwa na ƙananan yaro, duba tsarin hannu da ƙafa. A cikin ciki na tayin, tsarin hanta, gaban ciki da kuma mafitsara, an lura da kodan da kuma hanji.
Duban dan tayi a ciki a makon 21-22
A cikin mako ɗaya, matakan sasantawa na duban dan tayi sun riga sun canza sosai kuma suna da ka'idoji masu zuwa:
- BDP (girman kwanyar kwanyar kwanyar) - 51.6 - 54.2 mm;
- DB (tsawon cinya) - 35.3 - 38.3 mm;
- LTE (adadin kwanyar kwanyar kafa) - 64 - 67 mm;
- SJ (nufin diamita na ciki) - 52.5 - 56.4 mm;
- SDHK (nufin diamita na kirji) - 46.4 - 49.4 mm.
Dukkan jarrabawar yanayin tayi, wanda ya kamata a yi akan gwajin gwaje-gwaje, ci gaba da yin a wannan lokaci. 21 makonni na ciki shine lokaci lokacin da jima'i na tayin ke bayyane a bayyane a kan duban dan tayi: yarinyar ko yarinya. A wannan lokaci, kowane haɓakawa daga ka'idoji don duban dan tayi ya kamata a nemi shawara tare da kwararru masu dacewa don ganewar asali da jituwa da kuma jituwa da yanayin tayi na ciwon ci gaban.