The terminal segment of the ureter is located in the pelvis and is the narrowest part of the ureter. The ureter is divided into 3 segments called the abdominal, pelvic, and cystic segments. The abdominal segment is from the pyeloureteral junction to the transiliac vessels. The pelvic segment is from the transiliac vessels to the bladder wall. The bladder segment is defined as traveling medially and obliquely from the bladder wall to the bladder mucosa, which opens into the bladder. The terminal ureteral segment is usually referred to as the ureteral bladder segment. The ureter, which joins the renal pelvis above and the bladder below, is a long, thin tube with an average diameter of 0.5 to 0.7 centimeters and a total length of 25 to 35 centimeters, one on each side. The terminal segment of the ureter is the narrowest part of the entire ureter, with a diameter of only 1~2 millimeters. The blood supply of the end ureter is supplied by the inferior cystic artery. The ureteral nerve is an autonomic nerve that originates from the infra-abdominal and renal plexus and distributes in the connective tissue of the ureter before entering the muscularis propria.