Renal Pelvis and Ureters
The renal pelvis and ureter are part of the urinary system and make up the upper urinary tract. The renal pelvis is a hollow part in the middle of each kidney. The ureters are thin tubes that connect the kidneys to the bladder. Each ureter is about 25 to 30 cm (10 to 12 inches) long.
Urine (pee) is your body’s liquid waste and is made by the kidneys. It collects in the renal pelvis then travels along the ureters to the bladder where it is stored. When the bladder is full of urine, it passes out of the body through the urethra.