Kumapeto kwa masabata 4 chipatso chinakula kufika 1 mm ndipo kukula kwake tsopano ndi mbewu ya poppy. Panthawi imeneyi ya chitukuko, mwana wosabadwa wa dzira la fetus amayamba kusintha. Pa mimba pa sabata 4 kukula kwa chipatso ngakhale kuti ndi kakang'ono, koma kamwana kamene kamakhala ndi chidaliro kwambiri ndipo mochulukira chimakhudzidwa ndi khoma la chiberekero.
Kuyambira nthawi imeneyi, makina opangidwa ndi mitsempha amapangidwa kumalo kumene mluza umayendetsedwa ku khoma la uterine. Zisokonezozi zimagwirizanitsa mwana wamtsogolo ndi mayi ake, ndipo kudzera mwa iwo sangapeze zonse zofunika pamoyo ndi chitukuko. Pamene msinkhu wa msinkhu uli ndi masabata 4, ndiye kamwana kameneka kamayamba kukhala ndi ziwalo zowonjezereka, kupereka chakudya, kupuma ndi chitetezo. Matupi oterewa ndi awa:
- Choridi . Mbali yamakina yakunja yomwe imalimbikitsa chilengedwe cha placenta, chomwe chimapangidwa mwakhama pamapeto a sabata lachisanu ndi chiwiri.
- Amnion . Cavity, yomwe ndi chikhodzodzo cha fetus, imayambitsa amniotic fluid, yomwe imakhala m'mimba.
- The yolk sac . Mpaka ali ndi zaka 7 mpaka 8, iye ndi amene amachititsa kuti hematopoiesis a embryo ayambe kugwira ntchito.
Kodi mwanayo amawoneka bwanji ngati masabata 4?
Anthu ambiri amadabwa momwe mwanayo aliri masabata 4. Panthawi imeneyi, ikuwoneka ngati diski yomwe ili ndi zigawo zitatu za magulu - zigawo za majeremusi:
- ectoderm (kumtunda wakunja), yomwe imayambitsa mapangidwe a khungu, tsitsi, mitsempha, ma lens, ndi mazenera a dzino;
- Endoderm (mkati mwake), wotsogolera mapangidwe a chiwindi, chiwindi, chithokomiro ndi kapamba;
- mesoderm (m'kati mwake), yomwe pamapeto pake imasanduka mafupa, ziwalo zogwirizana ndi minofu, magazi ndi machitidwe osakanikirana, ziwalo zoberekera.
Mimba idzawoneka kumapeto kwa sabata, ngati itayesedwa. Kuyezetsa panyumba, satero nthawi zonse, chifukwa mkodzo wa mkazi uli ndi mahomoni ochuluka.