Urorectal septum

Urorectal septum

Infobox Embryology
Name = PAGENAME
Latin =
GraySubject = 241
GrayPage = 1109


Caption = Cloaca of human embryo from twenty-five to twenty-seven days old.


Caption2 =
System =
CarnegieStage =
Days = 32
Precursor =
GivesRiseTo =
MeshName =
MeshNumber =
DorlandsPre = s_08
DorlandsSuf = 12730653
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.cite journal |author=Escobar LF, Heiman M, Zimmer D, Careskey H |title=Urorectal septum malformation sequence: Prenatal progression, clinical report, and embryology review |journal=Am. J. Med. Genet. A |volume=143 |issue=22 |pages=2722–6 |year=2007 |pmid=17937427 |doi=10.1002/ajmg.a.31925]

References

External links

* http://cancerweb.ncl.ac.uk/cgi-bin/omd?urorectal+septum
* http://www.embryology.ch/anglais/turinary/urinbasse01.html
* http://isc.temple.edu/marino/embryology/parch98/parch_text.htm
* http://www.med.mun.ca/anatomyts/renal/akid5.htm
* http://www.med.umich.edu/lrc/coursepages/M1/embryology/embryo/10digestivesystem.htm


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  • urorectal septum — the caudally and outwardly growing wedge of endoderm covered mesoderm that divides the cloaca into the urogenital sinus and rectum, and the cloacal outlet into the urogenital orifice and anus; called also urorectal fold and cloacal s …   Medical dictionary

  • Septum — A word borrowed from the Latin "saeptum" meaning a "dividing wall or enclosure." * * * 1. [TA] A thin wall dividing two cavities or masses of softer tissue. See septal area, transparent s.. 2. In fungi, a wall; usually a cross …   Medical dictionary

  • urorectal fold — see under septum …   Medical dictionary

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  • membrane — 1. A thin sheet or layer of pliable tissue, serving as a covering or envelope of a part, as the lining of a cavity, as a partition or septum, or to connect two structures. SYN: membrana [TA]. 2. SYN: biomembrane. [L. membrana, a skin or m …   Medical dictionary

  • Embryology — 1 morula, 2 blastula 1 blastula, 2 gastrula with blastopor …   Wikipedia

  • fold — 1. A ridge or margin apparently formed by the doubling back of a lamina. SYN: plica. 2. In the embryo, a transient elevation or reduplication of tissue in the form of a lamina …   Medical dictionary

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