sacral plexuses

Main Entry: sacral plexus
Function: noun
: a nerve plexus that lies against the posterior and lateral walls of the pelvis, is formed by the union of the lumbosacral trunkand the first, second, and third sacral nerves, and continues into the thigh as the sciatic nerve

sacral plexus n.
A plexus formed by the fourth and fifth lumbar nerves and by the first, second, and third sacral nerves, lying on the posterior wall of the pelvis and supplying the lower limbs.