Yolk-sac

Choyamba kudyetsa zipatso thupi - ndi yolk sac. Linalake, kapena m'malo monga nthawi yabwino ya yatsoka - tsiku 15-16 ya linagwira lapansi. Ndi chinthu anapangidwa kuchokera endoblasticheskogo kuwira, lomwe lachokera embryoblast. Maphunziro pang'ono, amene ali mwachindunji kukhudzana ndi dzira ndi wapadera kapangidwe kake ndi ntchito iwo kuchita.

Chidwi ndi chakuti ndi yolk sac zinagwira mapangidwe maselo a mwazi ndi zopezera yaing'ono capillary. Kale ndi masiku 18-20 mazira yoopsa mmenemo angazindikire yaing'ono mauna magazi.

Motero, thupi la munthu wofunika kwambiri tsogolo la mwanayo. Ndipotu, mpaka nthawi imene latuluka si apanga ndi zopezera wandiweyani magazi, onse zakudya ndi Ndisanaumbidwe adzakhala anachokera ku mapangidwe yolk.

Pofika tsiku 30 wa yolk sac Amakweza chachikulu maselo nyongolosi kwa mwana wosabadwayo - amayamba zoberekera mwana. Anthu ambiri amaganiza kuti pa nthawi ino kuthetsa, amene anabadwa mnyamata kapena mtsikana. Komabe, makolo achinyamata ayenera kudziwa kuti kugonana mwanayo sanasankhebe pa nthawi ya umuna, ndipo magawo ena osiyanasiyana yekha anapanga matupi, malinga ndi zomwe chibadwa.

mbali zambiri za kudya limba chachikulu sikuthetsa kumeneko. Mwazina, milungu 6 yoopsa yolk sac ndi chiwindi imagwira ntchito, koma m'malo synthesizes mapuloteni: alpha-fetoprotein, transferrin, Alpha 2-microglobulin.

Kumbukirani kuti thupi akadali mtundu wa chipolopolo ndi zipatso, mpaka dongosolo lake m'thupi sangathe yokha kuthana ndi tizilombo toyambitsa matenda ndi zotheka. chakuti ziwalo chachikulu cha mwana wosabadwayo akhoza mosadalira kubala macrophages kulimbana ndi matenda. Choncho chimateteza dzira kuchokera kungasokoneze kuchokera kunja.

Chotero dongosolo la zothandizira mipingo yawo ndi kupereka zipatso yaitali kwambiri, mapeto a trimester wa yolk sac ziwole ndipo inasanduka yaing'ono maphunziro umbilical. Nthawi iyi, ntchito zake zonse ankaganiza ndi nsengwa ndi aumbike ndi ziwalo zina za mwana wosabadwayo.

Izo ziyenera kuti ngati pazifukwa zosiyanasiyana, mapangidwe yolk akuyamba amayambiranso kufika, kodi kupanga nsengwa ndi zina maphunziro ofunika, padera nkotheka kapena imfa yoopsa. N'chifukwa chake pali nyengo pamene kuli kofunikira pochitika ultrasound.

Kodi ndingapeze pa yolk sac ndi kudziwa magwiridwe ake?

Akazi amene akukonzekera kubadwa kwa mwana, mwina kale kuwerenga mabuku amene ultrasound yolk sac Tingaone kokha ndi masabata 6 chitukuko yoopsa, ndi zina ina. Izi zikhoza kukhala chifukwa Mbali a dongosolo la linagwira kapena tilinazo zida za.

Ngati ultrasound kukuuzani kuti yolk sac si anawamasulira yomweyo sayenera mantha. Mvetserani kwa dokotala mpaka kumapeto. Ndithudi iye kufotokoza zonse.

Pali mitundu yambiri ya kudwala mimba, imene thumba yafupika molawirira kwambiri, kapena si mokwanira otukuka. Mkazi ayenera kuzindikira kuti ngakhale ngati inu kutsindikiza kusunga mimba, Mwina malformations choterechi mwana amawonjezera.

Izo ziyenera ananena kuti kuwunika chitukuko ya yolk wa maphunziro kwa masabata 12 a mimba akhonza kuyankhula zokhudzana Zitatero zina ndi chitukuko cha mwana wosabadwayo, ndi chimene mavuto angakumane nawo madokotala ndiponso makolo awo.

Pali chinthu chotero monga "anaphonya mimba" - ndi kudwala kwa yolk sac, kumene ali wamng'ono ndipo sanali zinchito. Wosabadwa kufika siteji zina za chitukuko komanso sikokwanira kwa zakudya zina kukula. Zikatere m'pofunika kuyeretsa uterine M'mimbamo molumikizana ndi mankhwala m'thupi.