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The median nerve is one of the main nerves in the hand. It originates as a group of nerve roots in the neck. These roots come together to form a single nerve in the arm. The median nerve goes down the arm and forearm, passes through the carpal tunnel at the wrist, and goes into the hand. The nerve provides feeling in the thumb and index, middle, and ring fingers. The nerve also controls the muscles around the base of the thumb.
Your sciatic nerve begins at your spinal cord, runs through your hips and buttocks, and then branches down each leg. This nerve is your bodyâs longest nerve and one of the most important ones. It has a direct effect on your ability to control and feel your legs. When this nerve is irritated, youâll experience sciatica.