and it stays relaxed whilst the bladder is filling. The wall of the urinary bladder is normally 3-5 mm thick. When well distended, the wall is normally less than 3 mm.

Nearby structures

In males, the prostate gland lies outside the opening for the urethra. The middle lobe of the prostate causes an elevation in the mucous membrane behind the internal urethral orifice called the uvula of urinary bladder. The uvula can enlarge when the prostate becomes enlarged.

The bladder is

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