The Nervous System is the fast-acting control system of the body; responds to internal as well as external changes by activating the appropriate muscles and glands.
Every thought, action, and emotion reflects the nervous systems activity.
The Nervous System can be divided into 2 parts. The Central Nervous System (CNS) consists of the brain and spinal cord, which is in the dorsal body cavity. The Peripheral Nervous System (PNS) consists of nerves that extend from the brain and spinal cord.
Spinal nerves carry impulses to and from the spinal cord. The cranial nerves carry impulses to and from the brain.
Neurons (nerve cells) ae the structural unit of the nervous system.
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