Ubudala be-fetus emasontweni amathathu wokubeletha kuphela ngesonto elilodwa kusukela ekuqaleni kokukhulelwa konke. Iqanda, elikhuliswe kahle, aliyeki ukuhlukanisa futhi lilandele indawo yokunamathiselwe kwayo. I-fetus esontweni lesithathu lokukhulelwa linomumo wamabelebhili, ngakho-ke ezinye izigciwane zezinsizwa ziyibiza ngokuthi i-morula.
I-Fetus evikini lesithathu lokukhulelwa
Ngokuhamba kancane kodwa kancane kancane, isimo se-embryo siba siphezulu, futhi umgodi webhola obhekiwe ugcwele uketshezi. Ingqimba yangaphandle ihloswe ukuba ifakwe eludongeni lwe-uterine, kuyilapho isendlalelo sangaphakathi kuhloswe ukuba kube i-disc embryonic. Esikhathini esithile kamuva umbungu uzobe ukhululekile, umzimba wayo uzothuthukisa futhi wande engxenyeni engezansi. Lapho ukhulelwa emasontweni amathathu ubukhulu bomntwana buzovumela i-disk embryonic ukuba igwebe emhubheni, ngenxa yalokho ikhanda liqala ukudala kusukela ekupheleni okubanzi, futhi kusuka emncinci - i-coccyx. Amaseli wesondo kakade aqala ukwakha.
Emasontweni amathathu u-fetus uqala ukunamathisela odongeni lwesibeletho, lapho i-blastocyst isula khona izingcezu ezingaphezulu, okwenza ukucindezeleka okuncane. Le nqubo ibizwa ngokuthi i- plantation futhi ithatha cishe amahora angu-40. Phakathi nalesi sikhathi, owesifazane angabona ukukhishwa okungenani kwegazi, okuyinto evamile.
Usayizi we-fetal emavikini amathathu
Emasontweni amathathu, ubukhulu be-fetus buyaqhubeka banda, okuholela ekuqothulweni kwezinqolobane zangaphakathi. Okwamanje kufika isikhathi lapho eqala ukuthembela ngokugcwele emzimbeni womama,
Ubukhulu be-fetus esontweni lesithathu lokubeletha kubangele ekukhiqizeni i-hormone ekhethekile - i- progesterone . Nguye obangela ukukhiqizwa kwesinye isikhumba sembele, esizobe sesiba yi-placenta - isitho esibalulekile sesikhashana. Ubungako be-fetus emasontweni amathathu ukubeletha kungamamitha amabili kuphela ubude. Iqukethe cishe ama-250 amangqamuzana, ahlukana njalo.
Owesifazane yena uhlale engacabangi ukuthi uhlobo luni lwesithelo lukhona emavikini amathathu, njengoba engazi ngisho nesikhundla sakhe esisha.