Embryogenesis

ukuthuthukiswa embryonic kuqala lapho owesifazane ebamba futhi uyaqhubeka kuze umuntu ezweni. Ngokuvamile ukuthuthukiswa natal siqukethe 2 izigaba: owokuqala izinyanga ezimbili - embryonic, futhi okwalandela (3-9) abizwa ngokuthi fetus. ukuthuthukiswa Natal ihlala izinsuku cishe ngo-280, noma izinyanga ezingu-9. Umbungu umkhuba azoya ubizwa ngokuthi umbungu, okuyinto eba emzimbeni cishe izinyanga ezimbili, khona-ke i-embryo ibizwa ngokuthi umntwana.

ukuthuthukiswa embryonic kusukela kokukhulelwa bekufike isikhathi sokubeletha

Kwemisipha emgodleni EPITHELIAL kuyehla, okubangela iqanda ukuthuthela bubheke fallopian tube sperm germ cells besilisa. Ngenxa yalokho, kokukhulelwa kwenzeka. Iqanda akwazi ukungena isidoda eyodwa kuphela, bese emhlabeni kubonakala igobolondo ovikelayo oluvimbela ingress nezinye isidoda. ukuthuthukiswa embryonic iqala ngamadijithi Fusion nuclei ezimbili ukwakha iqoqo ezithile zofuzo. Ngemva kwalokho uqala zokuqala yentuthuko embryo yoke, okuyizinto amaseli ahlukaniselwe abaningi abancane.

Kid odla zigcine isikhuphasha, ezisebusweni iqanda. Ngemva kwesikhathi esithile umbungu ingena kwesibeletho futhi okunamathiselwe kwenzeka, noma yenzeka. Kakade ngosuku 7th umntwana kancane kancane busuka kwesibeletho. Ngemva kwalokho, i-embryo iqala ukukhiqiza gonadotropin chorionic, i-hormone, okuyinto isibonakaliso unina sokukhulelwa eyalandela (okungukuthi, ihlinzeka ukubukeka amaviyo amabili phezu test).

10-14 usuku embryo yoke, ukuthuthukiswa esiqhutshwa ngejubane evamile, kuba izikhathi ezingaphezu kuka-2. Okulandelayo ukuthuthukiswa embryonic kwenzeka ngokushesha ngokushesha. Isimiso sezinzwa uqala ukwakha kakade ngosuku lama-20 owesifazane ekhulelwe. Ngemva kwamasonto amathathu, inhliziyo womntwana ishaya. Isikhathi cishe ezingu-28, umgogodla kanye nemisipha. Ngosizo ultrasound ebonakalayo izingalo, imilenze, izindlebe namehlo ingane.

Ezinsukwini ezingu-30 nje, usayizi ingane liye landa ayizinkulungwane 10 izikhathi, futhi uyaqhubeka ukuthuthukisa ngokushesha. Ngemva kwezinsuku eziyisihlanu bebe iminwe ukubonakala ku ezandleni nasezinyaweni, amehlo mnyama njengoba ingane umzimba eba sombala ekhethekile.

Ukuze isikhathi esingamasonto 6, ubuchopho iqala ukulawula ukuhamba inhliziyo nemisipha umbungu. Isibindi ukhiqiza amangqamuzana egazi. Ngemva kwenye ngesonto kukhona phakade ingane, okuyinto ukuvikela amehlo kusukela ukoma futhi ukukhanya. Kulesi sigaba yokukhulelwa ngenkuthalo kwakheka zangaphandle zengaphakathi lendlebe ka the umklamo ingane izinyo kuphakama futhi ziyahlangana emhlathini. Kodwa lolu shintsho ezibaluleke kakhulu futhi okuphawulekayo ukuthi umuntu uqala ezihambayo esibelethweni. Ngeshwa, ukuthi usemncane kakhulu ukuba umama waba nomuzwa lezi perturbations.

8 amasonto - isehlakalo esibaluleke kakhulu endimeni ukuthuthukiswa ingane. Kulesi sigaba yentuthuko, sesivele libukeka indoda. Ubukhulu bayo 5 cm 2 kuphela, kanti futhi luye eshaya kancane kancane inhliziyo, imisipha encishisiwe, umuntu ozuza izici ezithile, futhi umzimba eyenza ngayo uma icindezelwa. Ngemva 2 amaviki ingane ekhula 4 cm nesisindo cishe amagremu ezimbili. Le nkathi libhekene kumiswa umthondo womntwana.

Eemvekeni ezi-12 wayethethelela abancela umunwe wakhe futhi ngamandla izitimela imisipha. Umntwana uqala ujikise ikhanda lakho, agobe iminwe yakho izibambo, ukuze uqale futhi uphethe umlomo. Kuleli umbungu eside akubonayo nakuzwayo, uvala izindlebe zakhe ekuphenduleni imisindo abukhali futhi kuyasuka ugongolo ukukhanya okukhulu. Phakathi 16 kuya 24 izinguquko asebenzayo masonto onke kwenzeka lapho aqukethe ekubukekeni izinwele, cilia. Baby is smiling, hiccups, futhi umama uba nomuzwa ke ngokugqamile. Kusukela amasonto 24 phezu 34 ukuthuthukiswa embryonic sekuyaphela, umntwana usuke ngokukhululekile eveza imizwelo (injabulo, intukuthelo, ukucasuka) kakade. Yena ungabona amaphupho. I isithombe sikhombisa isipanji eqolo noma ukumamatheka. amasonto 36-38 is final ekukhuleni kwengane esiteji. Manje ukulungele wayeyozalelwaphi.