Âmnio e Camadas Germinativas

Roteiro: Ngeviki 1, amaseli enqwaba yamaseli engaphakathi akha izingqimba ezimbili okuthiwa yi-hypoblast ne-epiblast.

I-hypoblast yakha i-yolk sac (isikhupahshi), okungesinye sezakhiwo okuthi ngaso umama aphakele izakhamzimba kumbungu wasekuqaleni.

Amaseli aphuma kwi-epiblast akha ijwabu okuthiwa yi-amnion, ngaphakathi embungwini kamuva kwi-fetus liyakhula kuze kube wukuzalwa.

Cishe ngo 2 1/2 amaviki, i-epiblast seyakhe 3 amathishu ayisipesheli, noma izingqimba zamagciwane, okuthiwa yi-ectoderm, endoderm, ne-mesoderm.

I-ectoderm yakha izakhiwo eziningi kubandakanya ubucopho, umgogodla, imizwa, isikhumba, izinzipho, nezinwele.

I-endoderm ikhiqiza untwentwesi lomgudu wokuphefumula nolomgudu wokugaywa kokudla, bese yenza izingxenye zezitho ezisemqoka njengesibindi namanyikwe.

I-mesoderm yakha inhliziyo, izinso, amathambo, uqwanga, imisipha, amaseli egazi, nezinye izakhiwo.