The ureteric orifices are the two slit-like openings where the ureters enter the bladder. They form the upper corners of the trigone, about 2.5 cm apart in an empty bladder.
| Location | Posterolateral corners of the bladder trigone |
|---|---|
| Parts |
|
| Nerve Supply | Inferior hypogastric (vesical) plexus |
| Blood Supply | Superior and inferior vesical arteries |
| Venous drainage | |
| Lymphatic drainage |
|
Let urine enter the bladder; the oblique passage through the wall acts as a valve that prevents backflow when the bladder contracts.
If the passage through the wall is too short, urine refluxes towards the kidney (vesicoureteric reflux), a common cause of kidney infection in children. The narrow orifice is the commonest place for kidney stones to stick.
Backflow of urine from the bladder into the ureter, predisposing to kidney infection and scarring.
A stone lodged at the orifice causing severe loin-to-groin pain.
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