Internal urethral orifice

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Internal urethral orifice
Illu bladder.jpg
Urinary bladder
The interior of bladder.
Latin ostium urethrae internum
Gray's subject #255 1232
Dorlands/Elsevier o_09/12602099

The internal urethral orifice is the opening of the urethra into the urinary bladder. 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 was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.