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Sympathetic Nervous System
A division of the autonomic nervous system responsible for mobilizing the body's fight-or-flight response during stress or danger.
Key Facts
- It regulates automatic functions like heart rate, respiration, and pupil dilation.
- In the eye, it maintains pupil dilation, eyelid elevation, and forward eye positioning.
- Damage to its nerve fibers disrupts normal ocular balance and leads to Horner's syndrome.
- It works in opposition to the parasympathetic nervous system to maintain physiological homeostasis.