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Endodermal derivation of the urogenital system highlighted in yellow. (A) The descent of the urogenital septum (or fold) at week 7. Note the intact cloacal membrane formed by the juxtaposition of ectodermal and endodermal elements; (B) breakdown of the cloacal membrane between weeks 8-9 and the final division between the rectum and urogenital system; (C) final differentiation of endodermal structures at 12 weeks.
