The 3 embryonic germ layers: ectoderm, mesoderm and endoderm are derived from:
Epiblast only
Ectoderm from epiblast; mesoderm and endoderm from hypoblast
Ectoderm and mesoderm from epiblast; endoderm from hypoblast
Hypoblast only
All three embryonic germ layers (ectoderm, mesoderm and endoderm) are derived from the epiblast only. The hypoblast contributes to the development of the extraembryonic mesoderm and yolk sac and plays a key role in signaling to establish axial patterning in the embryo itself