Internal urethral orifice

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Internal urethral orifice
Illu bladder.jpg
Urinary bladder
Gray1140.png
The interior of bladder.
Latin ostium urethrae internum
Gray's p.1232
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, and 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.

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This article incorporates text from a public domain edition of Gray's Anatomy.