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Internal urethral orifice
Urinary bladder
The interior of bladder.
Latinostium urethrae internum
Anatomical terminology

The internal urethral orifice is the opening of the urinary bladder into the urethra. It is placed at the apex of the trigonum vesicae, in the most dependent part of the bladder. It is usually somewhat crescent-shaped; the mucous membrane immediately behind it presents a slight elevation in males, the uvula vesicae, caused by the middle lobe of the prostate.

See also


Public domain This article incorporates text in the public domain from page 1232 of the 20th edition of Gray's Anatomy (1918)