The nervous system comports the brain, the spine, and a big system of nerves that wraps all the organs of the body. These three components help several parts of our organism to communicate and lets our brain control all the movements, feelings, thoughts, and reflexes.
If the nervous system didn't exist our brain would be a useless soft, wet, pulpy mass. Many functions of our body would be impaired, like the sight, the hearing, the speech, and the motion.
This is why it is important to take care of our brain and spinal cord and not to neglect any of the alarming symptoms of a brain or a spine disease.