Which duct ascends to abdomen and loops over the urinary bladder?

In frog the urinary bladder is

In mammals the urinary bladder opens into

In mammals the urinary bladder opens into

Urine is stored in urinary bladder till

The urinary bladder opens into

In rabbit, the urinary bladder opens into

Urine is stored in the urinary bladder before it is excreted. The urinary bladder can, expand and contract depending upon the amount of urine present it. Which system allows the expansion and contraction of the urinary bladder?