Âmnio e Camadas Germinativas

Roteiro: Evekeni yoku 1, amaseli wamaseli wobudisi wangaphakathi enza amalayini amabili abizwa nge-hypoblast ne-epiblast.

I-hypoblast yenza 147 umgodlana womthubi, okungomunye wemakhiwo umama athumela ngawo izakhiwo zomzimbha ku-embryo nayisathomako.

Amaseli aphuma ku-epiblast akha ithambo elibizwa nge-amnion, ngaphakathi kwalo la i-embryo ngemva kwesikhathi i-fetus ikhula bekufike isikhathi sokubeletha.

Ngeemveke ezi 2 no 1/2, i-epiblast yenzekile iinyamana ezi-3 ezikhethekileko, noma imikhakha, ebizwa nge-ectoderm, endoderm, ne mesoderm.

I-Ectoderm yona ibumbha imakhiwo embalwa okufaka hlangana ingqondo, ithambo lomgogodla, imizwa, isikhumba, amazipho, neenhluthu.

I-Endoderm iveza isikhumba sokuphefumula neziko lokugaya ukudla, begodu yakha iincenye zamalunga njengesibindi namanyaka (pancreas).

I-Mesoderm yakha ihliziyo, iziso, amathambo, namathambo amade (cartilage), imisipha, amaseli weengazi, neminye imakhiwo.