Urorectal septum

Urorectal septum

Cloaca of human embryo from twenty-five to twenty-seven days old.
Latin	septum urorectale
Gray's	subject #241 1109
Days	32
Code	TE E5.4.9.0.2.0.14

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 allantois 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

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

This article incorporates text from a public domain edition of Gray's Anatomy.

Prenatal development/Mammalian development of digestive system, coelom and septa, and mesenchymal mesenteric masses (GA 11.1101, TE E5.4, 5.8-9)

Gut

Upper GI tract and accessory	Stomodeum Foregut: upper GI Buccopharyngeal membrane Rathke's pouch Tracheoesophageal septum accessory Pancreatic bud Hepatic diverticulum

Lower GI tract	Midgut Hindgut: Urorectal septum Proctodeum Cloacal membrane Cloaca

Abdominopelvic

Mesentery	Dorsal mesentery Ventral mesentery

Thoracic diaphragm	Septum transversum

Other	Intra-embryonic coelom Extra-embryonic coelom

M: DIG

anat (t, g, p)/phys/devp/enzy

noco/cong/tumr, sysi/epon

proc, drug (A2A/2B/3/4/5/6/7/14/16), blte

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Urorectal septum