The nervous system has three main functions: receiving information, interpreting information, and making the body respond. It is divided into the central nervous system (brain and spinal cord) and peripheral nervous system (nerves throughout the body). The peripheral nervous system is further divided into the somatic nervous system (controls voluntary muscles and skin sensation) and autonomic nervous system (controls involuntary functions like heart rate through the sympathetic and parasympathetic divisions). Neurons are the basic functional units and transmit signals through electrical and chemical processes. Common nervous system ailments include multiple sclerosis, polio, brain tumors, meningitis, rabies, stroke, and encephalitis.

1. Nervous System

14. Parts of the Nervous System

16. Neurons

25. Spinal Cord

32. Brain

48. 4 Lobes or Sections of the Brain Lobe Concern Frontal Speech and movement Temporal Hearing and smell Parietal Taste and touch Occipital Sight

58. HOW THE NERVOUS SYSTEM WORKS

63. AILMENTS OF THE NERVOUS SYSTEM