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Parasympathetic Nervous System
The division of the autonomic nervous system that maintains baseline physiological functions and promotes rest-and-digest activities.
Key Facts
- It counterbalances the sympathetic system to restore the body to a resting state.
- In the eye, it controls pupil constriction, third eyelid elevation, and eye retraction.
- Its unopposed activity becomes clinically apparent when sympathetic input is lost.
- It operates continuously alongside the sympathetic system to maintain autonomic equilibrium.