- epiblast cells migrate through primitive streak
- form layer between epiblast and hypoblast (some hypoblast cells may be
included)
- these form trilaminar germ disc of
- ectoderm (epidermis and appendages, surface epithelial derivatives,
nervous system)
- mesoderm (dermis, musculature, vascular system)
- endoderm (epithelial lining og gut + derivatives)
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