The document discusses the central nervous system, which is made up of the spinal cord, brain, and nerves. The nerves help us feel, react, move, communicate, and send messages to the brain. Neurons are the nerve cells that work together to send different messages up to the brain. The peripheral nervous system includes the nerves that connect to the brain and spinal cord. The document also briefly mentions problems of the nervous system like strokes, care through vitamin D, the history of neurology, and the future research goals of scientists.