Epiblast

Epiblast
Human embryo at day 9. Epiblast (pink) is on top of the hypoblast (brown)
Details
Carnegie stage	3
Days	8
Precursor	Inner cell mass
Gives rise to	Ectoderm, mesoderm, endoderm
Identifiers
Latin	epiblastus
TE	E5.0.2.2.1.0.1
Anatomical terminology [edit on Wikidata]

In amniote embryonic development, the epiblast (also known as the primitive ectoderm) is one of two distinct cell layers arising from the inner cell mass in the mammalian blastocyst, or from the blastula in reptiles and birds. It drives the embryo proper through its differentiation into the three primary germ layers, ectoderm, mesoderm and endoderm, during gastrulation. The amniotic ectoderm and extraembryonic mesoderm also originate from the epiblast.

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