chorioallantois: the very vascular fetal membrane composed of the fused chorion and adjacent wall of the allantois
membrane: a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants
potemkin: a Russian officer and politician who was a favorite of Catherine II and in 1762 helped her to seize power; when she visited the Crimea in 1787 he gave the order for sham villages to be built (1739-1791)