The ejaculatory ducts are special channels located in the genitourinary system of male mammals. This system also includes the urethra, which has a large extent and performs the function of removing urine from the body. The vas deferens have many branches and together form a kind of tree with a large number of branches. Each additional channel performs its own function. The vas deferens is the pathway from the male's excretory system to the genitals for the excretion of seminal fluid.