| Urorectal septum | |
|---|---|
 Cloaca of human embryo from twenty-five to twenty-seven days old. | |
| Details | |
| Days | 32 |
| Precursor | Cloaca |
| System | Genitourinary system |
| Identifiers | |
| Latin | septum urorectale |
| TE | septum_by_E5.4.9.0.2.0.14 E5.4.9.0.2.0.14 |
| Anatomical terminology | |
The urorectal septum is an invagination of the cloaca. It divides it into a dorsal part (the hindgut) and a ventral part (the urogenital sinus). It invaginates from cranial to caudal, formed from the endodermal cloaca, and fuses with the cloacal membrane. Malformations can cause fistulas.