Archenteron

archenteron The endoderm-lined gut (enteron) hol­low cavity formed during the gastrulation process in metazoan embryos. The archenteron is formed by the infolding of part of the outer surface of the blastula and opening to the exterior via the blastopore. Also called the primitive gut, or gastrocoel in early embryon­ic development, it is the digestive cavity. The term is Greek for “primitive intestine.”