<prompt> Ureteric constriction in the following sites EXCEPTAt the pelviureteric junctionCrosses the internal iliac arteryAt bladder wallAt mesentery  <response>: At mesentery 301 - BDC - 2 370 - Snell 7thURETERS - The ureter enters the pelvis by crossing the bifurcation of the common iliac artery in front of the sacroiliac joint. Each ureter then runs down the lateral wall of the pelvis infront of the internal iliac artery to the region of the ischial spine and turns forward to enter the lateral angle of the bladder. Near its termination. It is crossed by the vas deferens. The ureter passes obliquely through the wall of the bladder for about 0.75 in 1.9cm before opening into the bladder.Three Constrictions SnellBDCi Where the renal pelvis joins the ureter in the abdomenii Where it is kinked as it crosses the pelvic brim to enter the pelvisiii Where it pierces the bladder walli At the pelvi ureteric Junctionii At the brim of the lesser pelvisiii At its passage through the bladder wall. 