The inner surface of the bladder is covered with mucosa. When the bladder wall contracts, the mucosa gathers into folds called bladder folds. On the inner surface of the bladder floor, there is a triangular area between the left and right ureteral orifice and the urethral orifice, where the bladder mucosa is closely connected with the muscular layer, lacking submucosa tissue, and it remains smooth no matter whether the bladder expands or contracts, which is called the bladder triangle.
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