Ukuphuhliswa kwe-intrauterine ye-fetus: izigaba eziphambili

Ukuphuhliswa kwe-intrauterine yomntu yithuba ukusuka kwithuba lokwakha i-zygote (iqanda elikhulayo) ekuzalweni komntwana ozalwe ngokupheleleyo osebenza ngaphandle kwesibeleko somfazi.

Eli xesha libizwa ngokuba yi-antenatal. Kuhlala iintsuku ezingama-280. Ezi zigaba zilandelayo zokuphuhliswa komntwana ziyahluka:

• ixesha eliqala-elibonakaliswe ngokutyunjwa kweqanda elichumayo, ukubunjwa kwe-blastula kunye nokufakelwa kwayo kwi-mucosa ye-uterine. Ukufakelwa kwemfuyo kwenzeka xa iseli zesini somfazi kunye nendoda idibanisa, apho i-zygote enezixhobo ze-genetic genetic. Kule meko, ubulili bomntwana bunqunywe ngama-chromosomes ye-spermatozoon, ekhulile iqanda. Ngoko, ukuba uqulethe i-chromosome ye-X, intombazana iya kuzalwa xa i-Y yinkwenkwe. Amanqanaba okuqala okuchotshozwa ayenzeka kwi-tube fallopian. Inkqubo yokufakela ukuzaliswa igqityiwe ngokulungisa iqanda elichumayo ngobuninzi bomgca we-uterus, apho uphuhliso olungaphezulu luqhubeka khona;

• ixesha le-embryonic - ukwakheka kwembungu kunye nokubekwa kwezitho zangaphakathi. Ukuphuhliswa kwe- intrauterine ye-fetus kule nqanaba kuyinkqubo yokugulisa, apho kusekho amaqabunga amathathu emibryonic. Ukongezelela, ngeli xesha i-herto- ne-organogenis iyadlula (izicubu kunye nezitho zibeka). Isibindi sesibhozo seesibhozo sele sele sinzima malunga ne-4 amagremu. Impawu zakhe zichazwe, imilenze kunye neepeni zenziwa;

• U Ixesha lesisu lihamba kunye nokukhula okuqhubekayo kunye nophuhliso lomntwana, oluvela ngenyanga yesithathu yokukhulelwa sele libizwa ngokuba ngumntwana. Ngeli xesha, i-nuclei ye-ossification ifomathi emathanjeni, ulusu luya kugutywa nge-fuzz, i- palpitation ye-fetus iqala ukuphulaphulwa , loo ntokazi ibona ukuhamba kwayo. Ukuphuhliswa kwe-intrauterine ye-fetus ngeli xesha kubonakaliswe iinkqubo ezinzulu zokukhula kunye nokwahlukana kwezicubu.

Isigaba sokugqibela kukuzala. Ukuqala kwabo kuqukumbela ngokukhululwa kwe- hormone oxytocin, ehlanganiswa yintsimbi ye-pituitary. Le hormone ibangela ukuphambana kwezihlunu ze-uterine, ezikhokelela ekunyanzeleni umntwana kwi-pelvis encinci kunye namanxiwa okuzalwa.

Kufuneka kuthathelwe ukuba uphuhliso lwe-intrauterine lwe-fetus lubonakaliswe ngamaxesha ahlukeneyo ahlukeneyo apho kukho ukunyuka kwenyameko kwimbungu kwizinto zangaphandle ezingekho phantsi. Iinyanga zokuqala ezintathu zokukhulelwa, kunye nokubeleka, kufuna ukunyuswa kwimeko yowesifazane okhulelweyo. Ngempembelelo yeemeko ezingqongileyo kwixesha langoku, ingozi yeempazamo ezahlukeneyo kunye nokukhubazeka, kunye neengxaki ngexesha lomsebenzi okanye emva kokuzalwa, ziyanda.

Kufuneka kwakhona kuqaphele ukuba uphuhliso lwe-intrauterine lwe-fetus luhambelana nokubunjwa kwelungu elikhethekileyo-i-placenta, evumela ukuba kuthwale iintsana esiswini. Yindlela ebalulekileyo yokulungelelanisa imeko yeemeko. Imisebenzi yayo eyona nto ithatha inxaxheba ekutshintsheni kwegesi yesisu, ukunikezwa kwayo ngezondlo kunye ne-oksijini, kunye nokugcinwa kweemodemoni eziqinisekisa inkqubo eqhelekileyo yexesha lonke lokukhulelwa.