Âmnio e Camadas Germinativas

Roteiro: Evikini le-1, tinhlayiya tencumbi yetinhlayiya letingekhatsi takha tincwencwe timbili letibitwa ngekutsi yihayiphoblast kanye ne-ephiblast.

Ihayiphoblast yenta kutsi kumile sikhwama semtfubi welicandza, lekungilesinye setakhiwo lesenta kutsi unina akwati kuniketa i-embriyo leseyincane kudla

Tinhlayiya letiku-ephiblast takha inyama letsambile lebitwa ngekutsi yi-amniyoni, lapho i-embriyo, ngekuhamba kwesikhatsi kulandzele ifithasi, kutawukhulela khona aze umntfwana atalwe.

Ngesikhatsi cishe lesingu 2 1/2 wemaviki, i-ephiblast ibe seyakhe 3 weticubu letikhetsekile, kumbe tingogo tetimbewana, letibitwa ngekutsi yi-ekthodem, i-endodem, kanye nemesodem.

I-ectodem yenta kutsi kumile takhiwo letinyentana kufake ekhatsi ingcondvo, umgogodla, imiva, sikhumba, tingalo, kanye netinwele.

I-endodem ikhicita lucwecwe loluvalewendlalele umgudvu wekuphefumula kanye nemgudvu logaya kudla, futsi imilisa tincenye tetakhiwo letinkhulu temtimba letifana nesibindzi kanye nemalulu.

Imesodem yakha inhlitiyo, tinso, ematsambo, ikhathilegi, imisipha, tinhlayiya tengati, kanye naletinye takhiwo.