Sinus tubercle (also known as sinual tubercle[1] or Müllerian eminence) 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.

[1] 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: