where is the sciatic nerve in the body?
<answer> The sciatic nerve begins in the lower back, extends through the buttocks and goes down the length of the leg. <context> The sciatic nerve begins in the lower back, extends through the buttocks and goes down the length of the leg. It is the longest nerve in the body. The pain that occurs when this nerve becomes inflamed or compressed is called sciatica. Sciatic pain symptoms can be felt at any part of the nerve or along its entire length.