to the yolk sac. The layer surrounding the inner cell mass, the trophectoderm, gives rise to the chorion.

Discovery of the epiblast

The epiblast was first discovered by Christian Heinrich Pander (1794-1865), a Baltic German biologist and embryologist. With the help of anatomist Ignaz Döllinger (1770-1841) and draftsman Eduard Joseph d'Alton