Where does your sciatic nerve originate from and how does it affect your body?

The sciatic nerve originates from the lower back and runs down the back of each leg. It is the longest nerve in the body and controls the muscles in the lower body and provides sensation to the legs and feet. When the sciatic nerve is compressed or irritated, it can cause pain, numbness, or weakness in the lower back, buttocks, legs, and feet, a condition known as sciatica.