Yayinda makonni 21 na ciki ya faru, ƙwayar jikin tayi kusan kama da tsarin jariri bayan haihuwa. Ya riga yana da dukkanin sassan jikin da tsarin, kuma a nan gaba ne kawai ci gaba da girma zasu faru. Sabili da haka makonni 21 - ƙarshen zamani na biyu na duban duban dan tayi - binciken da aka jarraba dukkanin jikin tayin don kasancewa a cikin lalacewa ta jiki.
Hawan ciki na ciki 21 - ci gaban tayin
A makon ashirin da 21 na ciki, nauyin nau'in tayi ba zai iya aunawa ba don nunawa - wadannan su ne alamun da ba su da kyau, koda yake jikin jiki ya kai 18 cm kuma nauyin ya kai 300 g.
Har sai wannan lokacin, mace dole ne ta ji motsin motsa jiki , idan har makonni 21 ba su rigaya ba - wannan zai iya zama damuwa.
Sati na 21 - nuna yawan girman tayin
A makonni 21, bisa ga yarjejeniyar, kusan dukkan kasusuwa, gabobin ciki da ƙananan ƙwararrun tayi. Na farko mai muhimmanci girman tayi a mako 21 shine kwakwalwa (51.6 mm a tsakanin kasusuwa biyu), girman girman kwanyar shine frontal-parietal (64 mm), yayin da tsarin kwakwalwa yake kama da na jariri.
A mako 21, ana auna dukkan kasusuwa tubular, yayin da:
- tsawon cinya - 35.3 mm;
- tsawon tsauraran - 33.5 mm;
- tsawon tsayi - 31.7 mm;
- Tsawon kasusuwa na goshin gaba shine 29.5 mm.
Kwanta na kirji a makon 21 yana da 46.4 mm, girman zuciya na fetal yana da 21.2 mm a diamita, 21.5 mm cikin tsawon, akwai ɗakin ɗakunan zuciya, rassansa na rhythmic, tare da mita 120-160 a minti ɗaya.
Matsakaitaccen diamita na ciki a makonni 21 yana da 52.5 mm, mai ciki yana bayyane bayyane, ƙananan madauri ba a fadi ba, bango na baya na kogin na ciki cikakke ne.
Duk kodan biyu suna bayyane har zuwa 20.3 mm tsawo, 11.1 mm a fadin, bowls da ƙashin ƙugu ba su da bambanci, da mafitsara ƙananan, yana cikin ƙananan pelvis, bayan urinating tayin, ya kusan ba a ganuwa.
Fetus a mako 21 na ciki
Matsayin tayin ne sau da yawa shugaban, amma koda kuwa jigilar, a wannan lokacin yaro zai iya juyawa yayin rana a cikin mahaifa, sabili da haka, har zuwa makonni 30 na ciki, ba'a damu da shi ba.
Tsakanin ya zama uniform, 25,6 mm lokacin farin ciki, da kauri daga cikin mahallin ruwa mai amniotic a cikin wuri kyauta daga sassan tayin daga 35 zuwa 70 mm. An rufe cervix a wannan lokaci.