Urogenital system of the 5-mm embryo.
Keywords: allantois, cloaca, cloacal membrane, gonadal ridge, hindgut, junction of mesonephric duct and urogenital sinus, mesonephric duct, mesonephros, neural tube, notochord, primitive filum terminale, tail bud, tail gut, urogenital sinus
Source: Atlas of Human Embryos.