part of part of develops from develops from renal system embryonic structure genitourinary system cloacal membrane urogenital membrane Ventral part of the cloacal membrane separating the gut from the fetus external environment. [TFD][VHOG] EMAPA:17378 RETIRED_EHDAA2:0002141 EHDAA2:0004025 EHDAA:7011 During the 7th week the urorectal septum divides the cloacal membrane into a urogenital membrane (ventrally) and an anal membrane (dorsally) [http://www.embryology.ch/anglais/ugenital/genitexterne01.html] VHOG:0001187 UBERON:0006307 SCTID:172994001