cloacal septum

cloacal septum

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5) It is thought that this OEIS complex results from a single defect of early blastogenesis or defect of a caudal mesodermal migration during primitive streak period that later contributes to the formation of infra umblical mesenchyme, cloacal septum and vertebrae.
A supernumerary cloacal septum that indents the epithelial of the urinary bladder.