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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 intraperitoneal in the larger species
 
*** It then becomes intraperitoneal in the larger species
* The paired '''uteric folds''' are visible even when the bladder is full.
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* The '''trigone''' of the bladder gets its name as it looks like a triangle without a base.
** They extend from the ureteral opening to the neck of the bladder
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** It is of clinical importance and is formed by the paired uteric folds
** Here they merge
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** It is visible even when the bladder is full
** Forms the urethral crest - continues into the urethra
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** The folds extend from the urethral opening to the neck of the bladder
** The triangular space they form is called the trigone and is of differant embryological origin to the rest of the wall.
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** Where they merge
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** It is of differant embryological origin to the rest of tissue.  More details can be found [[Developmental Anatomy of the Kidneys and Urinary Tract - Anatomy & Physiology#The Bladder|here]]
    
==Muscles of the Bladder==
 
==Muscles of the Bladder==
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