Sinus tubercle

Sinus tubercle
Urogenital sinus of female human embryo of eight and a half to nine weeks old.
Anatomical terminology [edit on Wikidata]

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:

• In the female, the mesonephric duct loses all association with the gonad and disappears. The sinus tubercle then gives rise to the sino-vaginal bulbs and, when it later becomes solid it is referred to as the vaginal plate.^[1] It likewise gives rise to the hymen, which eventually breaks down in most cases.
• In the males, the sinus tubercle gives rise to the seminal colliculus.