part of part of in taxon Vertebrata <vertebrates> renal system septum urorectal septum UBERON:0005760 EHDAA:5921 NCIT:C34323 Wikipedia:Urorectal_septum The ridge of mesoderm covered with endoderm that in the early developing embryo partitions the endodermal cloaca into the primary urogenital sinus (ventrally) and the anorectal canal of the hindgut (dorsally); the urorectal septum eventually fuses with the cloacal membrane, dividing it into a dorsal anal membrane and a larger ventral urogenital membrane - this area of fusion is represented in the adult by the perineal body[MP]. MA:0003235 urorectal fold EMAPA:17212 cloacal septum VHOG:0000018 EHDAA2:0002152 urorectal membrane internal anal region