| 词条 | Urorectal septum |
| 释义 |
| Name = Urorectal septum | Latin = septum urorectale | Image = Gray992.png | Caption = Cloaca of human embryo from twenty-five to twenty-seven days old. | Image2 = | Caption2 = | System = | CarnegieStage = | Days = 32 | Precursor = | GivesRiseTo = }} The endodermal 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. The urorectal septum eventually becomes part of the perineal body. Clinical significanceMalformation of the urorectal septum can lead to several different types of fistulas.[1] References{{Gray's}}1. ^{{Cite journal|vauthors=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}} External links
1 : Embryology of digestive system |
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