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the SNS fibers that dilate the eyes run down the brainstem here, and if compressed you get PNS overdrive that constricts the pupils but they are still reactive to light.

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13y ago

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How does a pontine haemorrhage produce a pinpoint pupil?

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One's pupils get smaller in bright light. An extremely bright light can make the pupils become quite small, like a pinpoint. Special situations which can produce pinpoint pupil other than light are: 1. Opium overdose 2. Organophosphate poisoning 3. Pontine haemorrhage


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