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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.
âPeripheral nerveâ is a term used synonymously to describe the peripheral nervous system. The peripheral nervous system is a network of 43 pairs of motor and sensory nerves that connect the brain and spinal cord (the central nervous system) to the entire human body.These nerves control the functions of sensation, movement and motor coordination. Brachial plexus nerve â This nerve is actually a network of nerves that consists of the last 4 cervical nerve roots (vertebrae C5-C8) and the first thoracic (vertebrae T1) nerve root, and ensures motion and feeling in the upper limbs.