endodermal cloaca

en·do·der·mal clo·a·ca

terminal portion of the hindgut internal to the cloacal membrane of the embryo.
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[8] Rudimentary horn with congenital rectovaginal fistula forms when Mullerian eminences open in the dorsal segment of the endodermal cloaca. [9] Unicornuate uterus with non-communicating rudimentary horn is a rare condition but is associated with many gynaecological and reproductive morbidities.
The rectum and bladder originate from the endodermal cloaca which is a single hollow tube.
The bladder and rectum originate from a single hollow tube, the endodermal cloaca. A mesodermal proliferation divides this tube into bladder and rectum beginning at around 5 weeks' gestation.