362 THE GENITO-URINARY SYSTEM 



separated by the psoas major muscle, and it crosses the 

 bifurcation of the common iliac artery at the upper aperture 

 (brim) of the pelvis. It then passes downwards in front of 

 the sacro-iliac joint and curves forwards and medially to enter 

 the supero-lateral angle of the basal, or posterior, surface of 



FIG. 126. The Spleen and the Left Kidney and Ureter outlined on 

 the Dorsal Aspect of the Body. The lower border of the left lung 

 and the lower limit of the left pleural sac are also shown. 



the bladder. The termination of the ureter in the adult lies 

 on a level with the second or third piece of the coccyx. 



As it descends through the abdomen, the ureter is crossed 

 by the mesentery and the terminal part of the ileum, on the 

 right side, and by the pelvic meso-colon, on the left side. 



Four slight constrictions ', which are sufficient to delay the 

 passage of a calculus, occur in the normal ureter. They are 



