This system (Apparatus urogenitalis) includes two groups of organs, the
urinary and the genital. The =urinary organs= elaborate and remove the
chief excretory fluid, the urine. The =genital organs= serve for the
formation, development, and expulsion of the products of the
reproductive glands. In the higher vertebrates the two apparatus are
independent except at the terminal part, which constitutes a urogenital
tract, and includes the vulva in the female and the greater part of the
urethra in the male.