The sacral plexus is a network of nerves located in the lower back, specifically in the region of the sacrum. It is formed by the anterior rami of the lower lumbar and sacral spinal nerves, primarily from L4 to S4. This plexus plays a crucial role in transmitting nerve signals to the pelvis and lower limbs. The sacral plexus gives rise to several important nerves, including the sciatic nerve, which is the largest nerve in the body. These nerves are responsible for motor and sensory functions in the legs, feet, and pelvic region, facilitating movement and sensation.