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- (n) originates in the thoracic regions of the spinal cord; opposes physiological effects of the parasympathetic: reduces digestive secretions; speeds the heart; contracts blood vessels
- Through these lymphatic channels any infection of the neck can spread and affect the sympathetic nervous system which serves the neck and eye sockets.
- The medulla originally buds off from the same cells which provide the sympathetic nervous system.
- Emotions affect the skin by first disturbing the sympathetic nervous system, then the blood vessels, muscles and nutrition of the skin itself.