The brain acts like the central computer controlling the communication with all structures of the body, named: Central Nervous System. The spinal cord, an extension of the brain, is organised in levels defined by each vertebra. Each vertebral level is called metameric level: like a regional manager. Each level is in charge to collect and distribute the messages (electrical impulse) from and to the brain. Each level, through the spinal nerves, manages the information coming from a particular grou

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