An incision (surgical procedure) made to enlarge a meatus (an opening or passage, especially one leading to the body surface), as of the urethra or ureter.

The urethra consists of transport tubes leading from the bladder to discharge urine outside the body.

The ureter is either of a pair of thick-walled tubes that carry urine from the kidney to the urinary bladder.

In males, the urethra travels through the penis, and carries semen as well as urine. In females, the urethra is shorter than in the male and emerges above the vaginal opening.