Sinus tubercle
Sinus tubercle is the proliferation of endoderm induced by the paramesonephric ducts. It is located in the developing fetus between the orifices of the Mesonephric ducts on the urogenital sinus. The uterovaginal primoridium, which is a fusion of the caudal ends of paramesonephric ducts, contacts the dorsal wall of the urogenital sinus and, induces the formation of the sinus tubercle. This occurs in both sexes:
