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The 12 Cranial Nerves. The nervous system is composed of 12 pairs of cranial nerves that controls all our body processes, motor and sensory. These cranial nerves are located at the bottom portion of the brain distributed into the four main parts: Diencephalon, Midbrain, Pons, and Medulla.What is the definition of nerve?
Nerve: A bundle of fibers that uses electrical and chemical signals to transmit sensory and motor information from one body part to another. The fibrous portions of a nerve are covered by a sheath called myelin and/or a membrane called neurilemma. (Note that entries for specific nerves can be found under the names of the particular nerves.