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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.
A nerve can be pinched as it leaves the spine by a herniated disc or bone spurs that form from spinal arthritis. Another common place for pinched nerves is the carpal tunnel. This is a bottleneck area, through which all the finger flexor tendons and the median nerve must pass to the hand.