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superior cervical ganglion - posterior view
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Interruption of the sympathetic pathway to the head produces Hornerís syndrome, with the following 4 symptoms:

1. mild ptosis (drooping) of the upper eyelid due to paralysis of Mullerís muscle (smooth muscle at deep aspect of LPS aponeurosis) Ė this ptosis disappears upon upward gaze due to intact skeletal muscle portion of LPS
2. miosis (abnormal constriction) of the pupil due to paralysis of dilator pupillae
3. loss of heat-induced sweating
4. loss of heat-induced or emotional vasodilation

Damage to specific damage to T1 of the spinal cord affects ocular symptoms but not those related to vasculature or swelling. Pathology of the internal carotid plexus (carrying sympathetics to the head) leads to miosis and mild ptosis, with vascular and sweating problems restricted to the forehead.
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