Tags: Anatomical Structure, Embryology.
The extraembryonic coelom (or Chorionic cavity) is a portion of the conceptus consisting of a cavity between Heuser’s membrane and the Trophoblast.During formation of the primitive yolk sac some of the migrating Hypoblast cells transdifferentiate into mesenchymal cells that fill the space between Heuser’s membrane and the Trophoblast forming the extraembryonic mesoderm.
