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Horner's syndrome describes the constriction of the pupil of one eye, the partial drooping of one eyelid, and the loss or reduction of sweating on that side of the face. What innervates all of those things? The sympathetic nervous system!
How do sympathetic nerves get to these places? Let's find out!
Then we can consider how these nerves might be injured and lead to Horner's syndrome, clueing us into what other pathology might be causing the signs and symptoms that we see.
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Music by Jahzzar
Album: HiFi City Tales
Song: Bodies
https://soundcloud.com/jahzzar