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embryonic cloaca

^ http://purl.obolibrary.org/obo/UBERON_0000163

Endoderm-lined chamber that develops as pouch-like dilation of the caudal end of the hindgut and receives the allantois ventrally and two mesonephric ducts laterally; caudally it ends blindly at the cloacal membrane formed by the union of proctodeal (anal pit) ectoderm and cloacal endoderm, with no intervening mesoderm[MP]. [ MP:0010115 http://en.wikipedia.org/wiki/Cloaca_(embryology) ]