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Peripheral nerves is a collective term for the cranial and spinal

nerves

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T Bundles of nerve fibers of the posterior root that carry

nervous impulses to the central nervous system

T The cell bodies of these nerve fibers are situated in a

swelling on the posterior root called the posterior root

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T Arises from the anterior root of the spinal cord

T Consists of bundles of nerve fibers carrying nerve impulses

away from the central nervous system

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Figure 5.1 Different stages in the development of the spinal cord showing theneural crest cells, which will form the first afferent neurons in the sensory

pathway

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Note: CN I and CN II are those nerves wherein their nuclei is not

located at the brainstem.

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