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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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12y ago
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5mo ago

Pontine lesions can affect the fibers of the Edinger-Westphal nucleus, which is responsible for pupil constriction. Damage to this area can result in unopposed sympathetic input, causing the pupils to become pinpoint due to prolonged pupillary constriction.

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Q: Why pontine lesion cause pinpoint pupil?
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Related questions

How does a pontine haemorrhage produce a pinpoint pupil?

A pontine, or brain stem hemorrhage, produces a pinpoint pupil because the fibers in the brain are unaffected. Therefore, dilation is interrupted, causing the pinpoint, but eyes can look relatively normal.


What can cause you to have pinpoint pupils?

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


Can lithium overdose produce pinpoint pupil?

Yes, lithium overdose can cause pinpoint pupils (miosis) as a symptom, often seen in combination with other symptoms such as confusion, drowsiness, and muscle weakness. It is important to seek immediate medical attention if you suspect a lithium overdose.


Is there a drug that causes pinpoint pupils?

The drugs that most commonly cause constricted pupils or "Pinpoint" are strong opiods such as Heroin, morphine, oxycodone, or high doses of norco / vicodin.


What illegal drugs cause pinpoint pupils?

Listing them all would be time-consuming so lets put it this way. Drugs can cause a pupil to change in two ways by dilation making the pupil larger or constricting the pupils. Only two drugs constrict the pupils those being opiates and alcohol. So anything but, these can cause the pupils to dilate.


Ten year child with high fever had an syncope attack early in the morning and pupil was pinpoint?

Take them to a doctor.


What is pontine haemorrhage?

Pontine hemorrhage is a type of intracerebral hemorrhage that occurs in the pons region of the brainstem. It can lead to symptoms such as difficulty with eye movements, facial weakness, and impaired consciousness. Emergency medical attention is needed as it can be life-threatening.


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Does methadone and xanax taken as prescribed cause pupil dilation?

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What is the possessive noun for pupil?

Pupil's The pupil's mother came to school.