Beginning with an exploration of nerve cells, this volume of the Encyclopedia of the Human Body discusses the parts of the central and peripheral nervous systems and how they work together in reflex responses and understanding sensory information. Major areas of the brain and the autonomic and peripheral nervous systems are covered. The five senses are discussed in relation to the nervous system. The history of the research on the nervous system is presented and the future of research in this field is considered. Current controversies and dilemmas of scientists performing this research are explored. Nervous system disorders, symptoms and treatments are explored, including multiple sclerosis and epilepsy. This reference concludes with information about maintaining a healthy nervous system, a comprehensive glossary, and resources for further information including Web sites and contact information for organizations and national health institutions.