Internal urethral orifice | |
---|---|
Details | |
Identifiers | |
Latin | ostium urethrae internum |
TA98 | A08.3.01.028F A08.3.01.027M |
TA2 | 3424 |
FMA | 85264 |
Anatomical terminology |
The internal urethral orifice is the opening of the urinary bladder into the urethra.[1]
It is usually somewhat crescent-shaped.[citation needed]
It is formed by the neck of the urinary bladder. It opens at the apex/inferior angle of the trigone of the bladder, some 2-3 cm anteromedial to either ureteral orifice.[1]
The mucous membrane immediately posterior to it presents a slight elevation in males - the uvula vesicae - caused by the middle lobe of the prostate.[citation needed]