Fig. 22. The kidneys and the urinary bladder. The two kidneys 

 are shown within an outline which suggests the body cavity. Their 

 advantageous connections with the chief artery and vein of the sys- 

 tem are indicated. Below is the bladder reached by the two ureters. 

 These vessels enter the bladder low down and behind not at the 

 level, where they disappear from the figure. 



