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The Nervous System • The NERVOUS SYSTEM controls and coordinates functions throughout the body and responds to internal and external stimuli NEURONS are cells that transmit messages, called IMPULSES, through the nervous system The CELL BODY contains the NUCLEUS and most of the cytoplasm, metabolic activity of the cell takes place here DENDRITES branch out from the cell body, and they carry impulses from the environment or from other neurons toward the cell body The AXON carries impulses away from the cell body. The Nervous System can be broken into two parts: • The CENTRAL NERVOUS SYSTEM: composed of the brain and the spinal cord • The PERIPHERAL NERVOUS SYSTEM: composed of all the nerves that aren’t part of the brain or spinal cord Central Nervous System • The skull and vertebral column protect the brain and spinal cord The Spinal Cord • Communication line between the brain and the rest of the body • Made up of bundles of nerves that branch out into the rest of the body Peripheral Nervous System • SENSORY DIVISION transmits impulses from the sense organs to the brain • MOTOR DIVISION transmits impulses from the brain to the muscles or glands Peripheral Nervous System • SOMATIC – regulates voluntary impulses • AUTONOMIC regulates the involuntary body functions