Urogenital sinus of female human embryo of eight and a half to nine weeks old. (Urogenital sinus labeled at bottom.)
|- style="text-align: center;" class="hiddenStructure"
| colspan="2" |
|- style="text-align: center; line-height: 1;" class="hiddenStructure"
| colspan="2" |Stages in the development of the external sexual organs in the male and female. ("Opening of urogenital sinus" labeled in diagram D.)
|- class="hiddenStructure"
|Latin
|colspan="2"|sinus urogenitalis
|- class="hiddenStructure"
|[[List of subjects in Gray's Anatomy:252#Gray.27s_page_.23|Gray's]]
|colspan="2"|[subject #252 ]
|- class="hiddenStructure"
|System
|colspan="2"|
|- class="hiddenStructure"
|Carnegie stage
|colspan="2"|[15]
|- class="hiddenStructure"
|Days
|colspan="2"|
|- class="hiddenStructure"
|Precursor
|colspan="2"|
|- class="hiddenStructure"
|Gives rise to
|colspan="2"|urethra, bladder, vagina
|- class="hiddenStructure"
|MeSH
|colspan="2"|[]
|- class="hiddenStructure"
|Dorlands/Elsevier
|colspan="2"|[s_12/12739359]
|}
The urogenital sinus (also known as the persistent cloaca) is a part of the human body while it is an embryo. It is the ventral part of the cloaca, formed after the cloaca separates from the rectum. It eventually becomes, among other things, the bladder.
A urogenital sinus anomaly is also a rare birth defect in women where the urethra and vagina both open into a common channel.
