part_of part of part of only in taxon only_in_taxon develops from develops from contributes to morphology of Vertebrata <vertebrates> embryonic cloaca primitive urogenital sinus http://upload.wikimedia.org/wikipedia/commons/6/6d/Gray1109.png NCIT:C34322 Wikipedia:Definitive_urogenital_sinus EHDAA:5029 UGS EMAPA:17379 UMLS:C0231057 VHOG:0000414 SCTID:50961009 fetal UGS EHDAA2:0004060 The ventral part of the cloaca remaining after septation of the rectum, which further develops into part of the bladder, part of the prostatic part of the male urethra and the urethra and vestibule in females. UBERON:0000164 EHDAA:5919 uberon embryonic structure intermediate mesoderm