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** When full and distended the folds dissapear and the wall appears thinner
 
** When full and distended the folds dissapear and the wall appears thinner
 
*** It then becomes intraperitioneal in the larger species
 
*** It then becomes intraperitioneal in the larger species
* The paired uteric folds are visible even when the bladder is full.
+
* The paired '''uteric folds''' are visible even when the bladder is full.
 
** They extend from the ureteral opening to the neck of the bladder
 
** They extend from the ureteral opening to the neck of the bladder
 
** Here they merge
 
** Here they merge
 
** Forms the urethral crest - continues into the urethra
 
** Forms the urethral crest - continues into the urethra
 +
** The triangular space they form is called the trigone and is of differant embryological origin to the rest of the wall.
    
===Muscles of the Bladder===
 
===Muscles of the Bladder===
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