<prompt> The narrowest pa of the ureter is at the:Uretero - pelvic junctionHiac vessel crossingPelvic ureterUretero - vesicle junction  <response>: D i.e. Uretero - vesicle junctionAt the level of ischial spine ureter changes its direction from down-backward to forward - medially but there is no constriction. The narrowest pa of ureter is uretero- vesicle junctions 