- A short trunk, which unites with the external iliac to form the common iliac vein.
- Its tributaries correspond in general to the branches of the internal iliac artery, with the exception of the umbilical and the iliolumbar arteries.
- Each of the viscera within the pelvis is surrounded by a network of relatively large, thin-walled veins, which have few valves.
- These plexuses communicate freely with each other and give rise to the visceral tributaries of the internal iliac vein.
- They also communicate with the parietal tributaries, and thereby provide easy pathways for the spread of infections.
- The plexuses are named as follows:
1) The Rectal venous plexus
2) The Vesical venous plexus
3) The Prostatic venous plexus
4) The Uterine venous plexus
5) The Vaginal venous plexus
6) The Sacral venous plexus