The document provides an overview of the nervous system and its major components, including: - The nervous system is made up of neurons that carry messages throughout the body. Neurons have dendrites, a cell body, and an axon. - Neurons communicate via electrical and chemical signals. When stimulated, they release neurotransmitters that can excite or inhibit the next neuron. - The central nervous system includes the brain and spinal cord. The brain controls functions like emotion, learning, memory, and movement. Different areas of the cortex control senses, movement, and higher thought. - The peripheral nervous system includes the somatic and autonomic nervous systems. The somatic system interacts with surroundings, while the auton