Isikhuphasha sac

Okokuqala ukondla izithelo umzimba - yolk sac. Norm, noma kunalokho nje isikhathi esingcono nesenzakalo - 15-16 ngosuku lo esibelethweni. Kuyinto into kwakhiwa kusukela endoblasticheskogo bubble, elisuselwa embryoblast. Lokhu kuya-, elisetendeni ukuthintana ngqo iqanda eselivundisiwe uhlukile ngezithako zawo kanye nemisebenzi abasenzela.

Abathandwayo Kuyaphawuleka ukuthi womthubi kuphakamisa kumiswa egazi nakunethiwekhi encane capillary. Kakade nge izinsuku 18-20 amaqanda fetus ingakwazi ukuzwa igazi anezikhala encane.

Ngakho, emzimbeni omunye wemizila ebaluleke kakhulu ikusasa ingane. Empeleni, kuze kube isikhathi lapho placenta akuyona wakhiwa inethiwekhi aminyene igazi, zonke izakhi umbungu uzobe ethathwe kumiswa isikhuphasha.

Kakade ngawo ngosuku 30 ye-yolk sac uyisa esiyinhloko germ cells ukuze umbungu - uqala ukwakha zokuzala uhlelo ingane. Abantu abaningi bacabanga ukuthi ngalesi sikhathi ukuxazulula owazalelwa umfana noma intombazane. Nokho, abazali abasha badinga ukwazi ukuthi ubulili wengane banquma ngesikhathi sokukhulelwa, kanye nazo zonke ezinye izigaba yentuthuko imizimba kuphela kwakhiwa, ngokuhambisana ukwaziswa kwezakhi zofuzo.

izici eziningi eyinhloko yokudla isitho akugcini lapho. Phakathi kwezinye izinto, kuze 6 amasonto of fetus isikhuphasha sac futhi isibindi eyenza umsebenzi, kodwa kunalokho synthesizes amaprotheni: alpha-fetoprotein, transferrin, i-alpha-2 microglobulin.

Kumele kukhunjulwe ukuthi umzimba namanje uhlobo igobolondo futhi izithelo, kuze amasosha omzimba akakwazi ngokwayo ukubhekana ne Amagciwane kungenzeka. Iqiniso lokuthi izitho eyinhloko i-fetus iyakwazi ngokuzimela ukukhiqiza ama-macrophage ukuze alwe namagciwane. Ngakho, livikela Iqanda elivundisiwe kusukela nomthelela omubi kulo kwabavela ngaphandle.

uhlelo ezinjalo wekwelekelel- nezithelo supply lide kakhulu, ekupheleni senyanga yokuqala isikhuphasha sac elilulaza bese ephenduka ibe imfundo encane enkabeni. Ngalesi sikhathi, yonke imisebenzi yayo azithathele kwakhiwa placenta is kanye nezinye izitho umbungu.

Kufanele ukuthi uma, ngenxa yanoma yisiphi isizathu, lapho kumiswa isikhuphasha uqala abaphindela iphuzu, indlela uyomenzela placenta nezinye imfundo ebalulekile, kungenzeka kwesisu noma ukufa fetus. Yingakho kukhona ngezikhathi ezithile lapho kudingeka kudlule ultrasound.

Ngingayithola kanjani-yolk sac futhi ukucacisa ukusebenza yayo?

Abesifazane abafuna silungiselela ukuzalwa komntwana, cishe kakade ukufunda izincwadi ukuthi ultrasound isikhuphasha sac kungabonwa kuphela amasonto 6 wokukhula kwengane esiswini, futhi kwezinye izimo kamuva. Lokhu kungase kube ngenxa isici ilungiselelo esibelethweni noma nozwela kulandzelana nekuhlunga tinsita.

Uma ultrasound bakutshele ukuthi womthubi akuyona elihunyushwe ngokushesha akudingeki ukwethuka. Lalela udokotela kuze kube sekupheleni. Impela uyakusitshela konke.

Kunezinhlobo eziningi zokugula yokukhulelwa, lapho isikhwama kuyehla ekuseni kakhulu, noma asenziwe ngokwanele athuthukile. Umuntu wesifazane kufanele uqonde ukuthi ngisho ngabe ukuphatha ukugcina sokukhulelwa, ematfuba kombungu anjalo esikhathini ingane kabili.

Kufanele ukuthi ukuqapha ukuthuthukiswa isikhuphasha lemfundo amasonto 12 okukhulelwa ungakhuluma mayelana nendlela phambili ukuqhubeka ukuthuthukiswa kwe-fetus, futhi yini yezinkinga ungase uhlangane odokotela nabazali.

Kukhona into okuthiwa "isisu ezingabanjwanga" - kuyinto zokugula ye-yolk sac, lapho has a amancane-non-zisebenza kahle. Fetus ufika kusigaba ethile yentuthuko, futhi akwanele okunye ukwanda izakhamzimba. Esimweni esinjalo kubalulekile ukuhlanza ingaphakathi lesizalo ngokuhlanganyela yokwelapha hormone.