BLADDER INSERTION

The ureters penetrate the thick wall of the bladder about 2.5 cm from the midline. They run in an anteromedial direction within the wall of the bladder and then terminate at the ureteric orifices, which are 2 cm apart in the nondistended bladder. As intravesicular pressure increases, the intramural portions of the ureters become compressed, preventing reflux of urine. In this distended state, the ureteric orifices spread to become 5 cm apart.