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  • First Order Neuron (Preganglionic): Hypothalamus → Spinal Cord

o   Caused by a stroke.

  • Second Order Neuron (Preganglionic): Spinal Cord → Superior Cervical Ganglion

o   Caused by a Pancoast ‘s Tumor at the apex of the lung.

  • Third Order Neuron (Postganglionic): Superior Cervical Ganglion → Eye and sweat glands

o   Caused by a vascular disorder (migraine, carotid-cavernous fistula)