Urorectal septum

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Overview

Urorectal septum
Gray992.png
Cloaca of human embryo from twenty-five to twenty-seven days old.
Gray's subject #241 1109
Days 32
Dorlands/Elsevier s_08/12730653

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The entodermal cloaca is divided into a dorsal and a ventral part by means of a partition, the urorectal septum, which grows downward from the ridge separating the allantoic from the cloacal opening of the intestine and ultimately fuses with the cloacal membrane and divides it into an anal and a urogenital part. The dorsal part of the cloaca forms the rectum, and the anterior part of the urogenital sinus and bladder.

Clinical significance

Malformation of the urorectal septum can lead to several different types of fistulas.[1]

References

  1. Escobar LF, Heiman M, Zimmer D, Careskey H (2007). "Urorectal septum malformation sequence: Prenatal progression, clinical report, and embryology review". Am. J. Med. Genet. A. 143 (22): 2722–6. PMID 17937427. doi:10.1002/ajmg.a.31925. 

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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.



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