The internal iliac vein and its branches is are part of several venous plexuses, which are interconnected networks of veins. These include the rectal, vesical, prostatic (in males), vaginal (in females), and uterine (in females) venous plexuses.
In a male, this vein will be in the region of the prostate gland. In a female, it will be in the uterine and vaginal areas.