I-chorion ingenye yezingqimba ze-placenta. Kuyinto engxenyeni yezingqinamba ezisezingeni eliphansi (ingqimba yayo ephakathi) futhi idlala indima enkulu ekusetshenzisweni komzimba kwe-fetus. Ngesikhathi sokubeletha, inkulumo ethi "isethulo se-chorion" ayilona iqiniso ngokuphelele, ngoba ingenye yezinambuzane eziphambili (okuphakathi), ngakho-ke inkulumo ethi "ilungiselelo lokubekezela" lisetshenziswa njalo. Indawo ekhethiwe ye-chorion yi-bottom kwesibeletho noma ingxenye engaphezulu yodonga olumile ngemuva. Kodwa ngezinye izikhathi i-chorion itholakala edongeni langaphambili lesisu noma esigabeni esingaphansi kwesibeletho. Kulesi sihloko, sizocabangela izici zenkambo yokukhulelwa lapho i-chorion isendaweni yangaphakathi nodonga lwangaphakathi.
Izinketho zendawo yokukhethwa
Indawo ejwayelekile kakhulu yendawo ye-chorion yindonga engemuva yesibindi ngokushintshela ezindaweni ezihamba phambili, ngaleli lungiselelo le-chorion, inkambo evelele kakhulu yokukhulelwa. Indawo yangasese ye-chorion evulekile eduze nodonga olungaphambili ibhekwa njengendlela ehlukile yokujwayelekile. Uma i-chorion itholakala phezulu eludongeni lwangaphakathi, khona-ke akukho nengozi yenkambo yokukhulelwa (okungenani u-3 cm ukusuka emphinjeni wangaphakathi wesibeletho).
I-Chorion ivela ekuqaleni kokubunjwa kwe-embryo, inesibopho sokuncelisa i-fetus ngaphambi kweviki le-13 lokukhulelwa. Kusukela ngesonto lama-13, lo msebenzi ubhekwa yi-placenta. Ekuqaleni, i-chorion inokubonakala kwezinto ezincane ezizungezile embryo, ngemva kwalokho lezi zinyuka zanda futhi ziba yi-chorionic villi.
Isethulo se-chorion
Isethulo se- chorion emdongeni ongemuva noma odongeni lwangaphakathi libeka usongo endleleni yokukhulelwa. Nika isethulo esincane (umkhawulo we-placenta uvala ingane yomlomo wesibeletho sangaphakathi) nesethulo esigcwele (i-placenta ihlanganisa umlomo wesibeletho sangaphakathi wesibeletho). Laba besifazane abakhulelwe badinga ukunakekelwa okhethekile, ngoba basengozini yokugaya izinhlungu. Uma isethulo se-chorion senziwa eceleni kwodonga lwangaphakathi, ingozi yokuphuma kwegazi iphakeme kakhulu, ngoba ingxenye engezansi yodonga lwangaphakathi lombelethi ihamba kangcono futhi ishesha futhi ngezinye izikhathi iphuma ekukhuleni kwe-placenta kunezimbangela zokuphuma kwegazi.
Sihlolisise izici zenkambo yokukhulelwa lapho i-chorion isendaweni ehambisana nodonga olungaphambili. Esimweni lapho i-chorion itholakale engxenyeni engenhla yesibindi sokukhulelwa akukho esongelwayo. Uma i-chorion ihlanganiswe nodonga lwangaphakathi lwesisu, engaphansi kwayo yesithathu, ingozi yokuphazamiseka kwe-placental ngaphambi kwesikhathi isanda.