Sympathetic Nervous System
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Visceral disturbances often result in increased musculoskeletal tension in structures innervated from the corresponding spinal level through somato-visceral reflexes.
The cell body of a sympathetic preganglionic nerve fiber lies in the spinal cord.
Sympathetic nerve fibers originating in the cervical segments of the cord terminate on the heart and lungs.
In the sympathetic nervous system, a preganglionic nerve fiber is relatively short when compared to a postganglionic fiber.