Epiblast

In embryology, the epiblast is a class of cells present during gastrulation. At this stage, the epiblast and hypoblast together form the bilaminar disk of the developing embryo. Both layers are derived from the inner cell mass.

Some sources state that only epiblast cells give rise to the three germ layers of the embryo,, some state that it gives rise to ectoderm and mesoderm, , while others state that it gives rise to ectoderm only.

In mammalian embryogenesis, the columnar cells of the epiblast are adjacent to the trophoblast, while the cuboidal cells of the hypoblast are closer to the Blastocoele.