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Sagot :
The organs of the head supplied with sympathetic innervation through the preganglionic neurons of the SANS originate in the thoracic and lumbar (T1 to L2) areas of the spinal cord, with the cell bodies dispersed in four symmetrically and bilaterally distributed regions of the grey matter.
Sympathetic innervation in some cranial nerves' distal branches do not travel from the brain or brain stem. Only in the thoracolumbar area of the spinal cord do sympathetic nerve impulses exit the brain. An element of the autonomic nervous system is the sympathetic nervous system. It is automatic and works with the parasympathetic nervous system to keep the body in equilibrium.
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