Description

The internal urethral orifice is placed at the apex of the trigonum vesicæ, in the most dependent part of the bladder, and is usually somewhat crescentic in form; the mucous membrane immediately behind it presents a slight elevation, the uvula vesicæ, caused by the middle lobe of the prostate.

When the urinary bladder fills, the orifice is closed and forms a flat sheet together with surrounding structure (Filling internal urethral orifice).

When the urinary bladderis emptying, the neck of bladder retracts like a funnel and the male urethra appears shortened (Emptying internal urethral orifice). 


This definition incorporates text from a public domain edition of Gray's Anatomy (20th U.S. edition of Gray's Anatomy of the Human Body, published in 1918 – from http://www.bartleby.com/107/).

Images

There is no image containing this anatomical part yet.

Download e-Anatomy

Mobile and tablet users, you can download e-Anatomy on Appstore or GooglePlay.

e-Anatomy on Appstore e-Anatomy on Googleplay

From other publishers