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The STRUCTURAL CLASSIFICATION of the nervous system includes all of the nervous system organs. It also has two subdivisions, the CNS and the PNS. The CNS consist of the brain and the spinal cord, both interpret incoming sensory information and issue instructions based on past experience. The PNS consist of nerves that extend from the brain and spinal cord, these nerves serve as communication lines.

The FUNCTIONAL CLASSIFICATION of the nervous system divides the PNS structures into two principal subdivisions. The first of which is called the SENSORY, OR AFFERENT DIVISION, it keeps the CNS constantly informed of events going on both inside and outside the body. The MOTOR/EFFERENT DIVISION, carries impulses from the CNS to effector organs, the muscles, and glands. These impulses activate muscles and glands, thus creating a "motor response."

I got this information almost word for word from my anatomy and physiology book, and my brain :P

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