Internal urethral orifice

Internal urethral orifice
Urinary bladder
The interior of bladder.
Details
Identifiers
Latin	ostium urethrae internum
Dorlands /Elsevier	o_09/12602099
TA	A08.3.01.028F A08.3.01.027M
FMA	85264
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.

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