MALE GENITOURINARY TRACT. The urinary and reproductory system in a man. We have the two kidneys in brown capped with their suprarenal glands in purple, then the ureters in orangish yellow that descend up to the bladder in whitish beige, then the prostate just beneath in pale pink, the urethra that descends, surrounded of the structures in pink of the penis. At the back of the prostate can be found the seminal vesicles, and the right and left vas deferent that descend on each side of the bladder