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What does the Edinger-Westphal nucleus do?

What does the Edinger-Westphal nucleus do?

The Edinger–Westphal nuclei provide preganglionic input to the ciliary ganglion mediating the pupillary light reflex and accommodation responses of the lens (i.e., the ciliary body).

Which cranial nerve is affected in stroke?

Acute brain stem stroke can present with isolated oculomotor palsy, and because the third cranial nerve nucleus is the largest, it is more prone to ischemic injury,7 hence the relatively higher risk of recurrent stroke in the first year.

Where is Edinger-Westphal nucleus?

The EWpg is what is thought of as the classic ONC—sending parasympathetic nerve fibers towards the eye. It is located in the midbrain immediately dorsal to the oculomotor nucleus near the level of the superior colliculus, which is why it is often included in the overarching term oculomotor complex.

Is 3rd nerve palsy an emergency?

Of all the cranial nerve palsies, isolated dysfunction of the third nerve (CN III) is a particularly thorny issue for the emergency physician. Although rare, it is a condition that demands thorough and appropriate eval- uation due to its frequent association with intracranial aneurysms (1,2).

What are the main causes of stroke?

There are two main causes of stroke: a blocked artery (ischemic stroke) or leaking or bursting of a blood vessel (hemorrhagic stroke). Some people may have only a temporary disruption of blood flow to the brain, known as a transient ischemic attack (TIA), that doesn’t cause lasting symptoms.

What causes eye palsy?

Sixth nerve palsy occurs when the sixth cranial nerve is damaged or doesn’t work right. It’s also known as the abducens nerve. This condition causes problems with eye movement. The sixth cranial nerve sends signals to your lateral rectus muscle.

What causes 4th nerve palsy?

In adults, the most common cause of fourth nerve palsy is injury. The injury may seem minor. Fourth nerve injury can occur with injuries that cause whiplash or concussions. Another common cause is from poor blood flow related to diabetes.

What is Benedikt syndrome?

Benedikt syndrome is an eponymously named neurological condition secondary to specific damage in the midbrain that causes ipsilateral oculomotor nerve palsy, contralateral hemiparesis, and contralateral cerebellar ataxia and/or Holmes tremor and/or choreoathetosis.

What is EOM palsy?

ophthalmoplegia, also called extraocular muscle palsy, paralysis of the extraocular muscles that control the movements of the eye. Ophthalmoplegia usually involves the third (oculomotor), fourth (trochlear), or sixth (abducens) cranial nerves. Double vision is the characteristic symptom in all three cases.

Can 3rd nerve palsy be cured?

Unfortunately, there is no treatment to re-establish function of the weak nerve if it is a congenital case. An acquired third nerve palsy may resolve, depending on the cause. Relief of pressure on the third nerve from a tumor or blood vessel (aneurysm) with surgery may improve the third nerve palsy.