Iqanda lokubeletha liyi-embryo kanye nejazi le-embryonic. Lesi sikhathi sokukhulelwa yisigaba sokuqala sokuthuthukiswa kokukhulelwa. Futhi konke kuqala ngokuxhumana kwamaseli amabili - owesilisa nowesilisa.
Okulandelayo, iqanda elikhuliswe liqala ukuhlukanisa, ngokuqala zibe izingxenye ezimbili, bese kuthi kube ngu-4 njalonjalo. Inani lamaseli, njengebukhulu bombungu, likhula njalo. Futhi wonke amaqembu amangqamuzana aqhubeka ahlukanisa, ahambe eduze kwe-tube fallopian eya endaweni yokufakelwa kwawo. Leli qembu lamaseli yiqanda lesithelo.
Uma usufinyelele umgomo, iqanda lokubeletha lifakwe kwelinye lamadonga esibeletho. Lokhu kwenzeka ngesonto emva kokukhulelwa. Kuze kube manje leli qanda lesisu lidla izinto ezikuqanda ngokwayo. Futhi emva kokusungulwa kwesibeletho, ukudla okunomsoco kwenziwa nge-mucosa yayo evuvukile, elungiselelwe uhlelo lokudla nokuthuthukisa imbungu kuze kufike ukwakhiwa kwe-placenta.
I-placenta, noma indawo yengane , yenziwa kusukela kwinqaba langaphandle leqanda lesisu, eligcwele i-villi. Lezi villi endaweni yokunamathiswa kweqanda le-fetal libhubhisa ingxenye encane yesibindi esiswini, kanye nezindonga zemithambo yegazi, ukugcwalisa ngegazi bese uphonsa endaweni elungiselelwe.
Iqanda lomntwana liyisibonakaliso sokuqala sokukhulelwa okuvamile. Kungabonakala ku-ultrasound ngemuva kwamasonto amabili okuya esikhathini. I-embryo ibonakala kuphela ngeviki lesihlanu lokukhulelwa. Kodwa uma ngalesi sikhathi udokotela ehlonza ukungabikho kombungu eqanda lomntwana-ngamanye amazwi, iqanda elingenalutho le-fetal, i-ultrasound iphindwe ngemva kwamasonto ambalwa.
Ngokuvamile kaningi kulokhu, emasontweni angu-6-7, i-embryo ne-palpitation iqala ukuboniswa. Uma iqanda lokubeletha lingasenalutho, lokhu kubonisa ukukhulelwa okungathuthuki. Ngaphandle kwalokhu kunzima, ezinkathini zokuqala zokukhulelwa, kungenzeka kube khona abanye - isimo esingavamile seqanda lesisu, indawo yalo engafanele, inqola, njll.
Yingakho kubalulekile ukudlulisa i-ultrasound ngokushesha ngangokunokwenzeka ukuze ukwazi ukushintsha isimo uma kungenakho ukulungiswa. Phela, ku-trimester yokuqala ingozi yokukhulelwa kwesisu, i-detachment kanye nezinye izifo ezinzima. Kodwa okwanele ngokudabukisayo.
Iqanda le-fetal emavikini okuqala lokukhulelwa linomumo we-oval. Futhi i-ultrasound ngokuvamile ihlola ububanzi bayo obuphakathi - i-SVD yeqanda le-fetal. Njengoba ububanzi beqanda le-fetal liguqukile, kunephutha ekunqumeni isikhathi sokutholwa kwalesi sikhombisi se-fetometric.
Ngokwesilinganiso, leli phutha liyi-1.5 amasonto. Isikhathi sokubeletha, njengombuso, sinqunyelwe hhayi kuphela yilo mbonakaliso, kodwa futhi amanani we- CTE we-fetus (usayizi we-coccygeal parietal) kanye neminye imingcele isetshenziswa.
Amaqanda amaqanda amaqanda ngamasonto
Ngakho-ke, usayizi weqanda lomntwana wesilisa ngamasonto. Uma iqanda lokubeletha lingama-4 mm ububanzi, lokhu kubonisa isikhathi esifushane kakhulu - kuze kube amasonto ayisithupha. Kungenzeka ukuthi manje iqanda lesisu lihambisana nenkathi yamasonto amane. Emasontweni ama-5, i-SVD ingama-6 mm, futhi emavikini ama-5 nezinsuku ezintathu i-egg fetal ine-7 mm.
Emasontweni ayisithupha, iqanda le-fetal likhula lifika ku-11-18 mm, kanti ububanzi obungaphakathi ngaphakathi kweqanda lomntwana obunama-16 mm lihambisana nenkathi yamaviki ayisithupha nezinsuku ezingu-5. Emasontweni ayisikhombisa okukhulelwa, ama-SVD aphakathi kuka-19 kuya ku-26 mm. Emasontweni ayisithupha iqanda le-fetal likhula lifika ku 27-34 mm, emavikini angu-9 - kuya ku-35-43 mm. Futhi ekupheleni kwamasonto angu-10 iqanda lesisu liba nobukhulu obungaba ngu-50 mm ububanzi.
Kulo mbuzo - ukuthi ijubane lokubeletha likhula ngokushesha kangakanani, singasho ngokuqiniseka: kuze kube amasonto 15 kuya ku-16 ubukhulu bayo bukhuphuka ngo-1 mm nsuku zonke. Ngaphezu kwalokho, ubukhulu beqanda lesisu likhula ngo-2-2.5 mm ngosuku.
Izindinganiso zobungako beqanda lesisu kanye nesisu kungenzeka futhi kulandelwe ngokwetafula.