I-placenta iyilungu elibaluleke kunazo zonke elibhekene nokuthuthukiswa okulungile kwengane esibelethweni somama. Uma i-placenta isakhiwe ngokugcwele, umntwana uthola indlu yakhe yokuqala (ngaphandle kwesizathu sokuthi i- placenta ibizwa ngokuthi indawo yengane ), okwenza kube lula ukwenza konke okudingekile ekukhuleni nasekuthuthukisweni, futhi ngakolunye uhlangothi - ivikela umnikazi wayo omncane emithonjeni eyingozi nokunye okungeyona into ewusizo kakhulu, esithombeni somama. Ngaphandle kokuhlinzeka nge-fetus ngezinto eziwusizo, i-placenta inesibopho sokunikezwa kwe-oksijini nokukhishwa kwemikhiqizo yemfucuza.
Ukwakhiwa kwe-placenta ngesikhathi sokukhulelwa
Kunzima ukunquma ngokunembile isikhathi lapho i-placenta iqala ukwakha, ngoba isigaba sokuqala singabizwa ukuthi sesivela ngosuku lwesishiyagalolunye emva kokukhulelwa. Kuleli qophelo, umbungu usika emgqonyeni we-uterine, uhlala endaweni okuthiwa i-lacuna, egcwele igazi lomama. Ngalesi sikhathi, i-chorion iqala - imvilophu yangaphandle ye-fetus, okungathiwa yi-precurse ye-placenta.
Isonto eli-15-16 lokukhulelwa - lesi yisikhathi sokubunjwa kwe-placenta. Ngesonto lama-20, lapho ilungu lilungele ukusebenza okuzimele, ukwakheka kwe-placenta kuphelile ngokuphelele.
Esikhathini esijwayelekile sokukhulelwa ngaphandle kwezinkinga kanye ne-pathologies, i-placenta yenziwa ngemuva noma udonga lwangaphambi kwesibeletho. Isikhathi sokwakheka kwe-placenta kungenxa yezici zomuntu ngamunye, kodwa njengombuso, ngeviki lama-36 lokukhulelwa i-organ iyafinyelela ekuvuthweni kwayo okusebenzayo. Ngokushesha ngaphambi kokuzalwa, i-placenta inokuphakama kwama-2 kuya ku-4 cm, futhi ububanzi bufinyelela ku-18 cm.
I-Placenta ngemva kokuzalwa
Kungakhathaliseki ukuthi mangakhi amasonto ama-placenta akhiwa, i-organ ihamba ngezinyathelo ezine zokuvuthwa ngesikhathi sokukhulelwa. Ngokumangazayo, ngaphambi kokuzalwa i-placenta isesimweni sokuguga ngokomzimba - ubukhulu bayo buyancipha kancane, futhi usawoti ubonakala phezulu. Lesi yisilinganiso sesine sokuvuthwa kwe-placenta .
Ngemuva kokubeletha, i-placenta ihlukaniswe kusuka ezindongeni zesisu ngokuzimela phakathi kwemizuzu engu-15-20. Kwezinye izimo, kungathatha isikhathi eside - kuze kube ngu-50 imizuzu. Udokotela kufanele ahlole ngokucophelela ubuqotho be-placenta ukuze aqiniseke ukuthi azikho izingcezu ezisele esibelethweni ezingabangela ukuvuvukala. Khona-ke i-placenta ithunyelwa ekutadisheni kwe-morphological, ngokusho imiphumela okungenzeka ngayo ukuhlola inkambo yokukhulelwa kanye nezizathu zokungaphambuki.