Keyword Analysis & Research: cranial nerves iii iv


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What cranial nerve is damaged?

If any of the three cranial nerves that control eye movement (3rd, 4th, or 6th cranial nerve) is damaged, people cannot move their eyes normally. Symptoms include double vision when looking in certain directions. If the 3rd cranial nerve (oculomotor nerve) is paralyzed, the upper eyelid is paralyzed.

Which cranial nerve is responsible for eye movement?

The abducens nerve controls another muscle that’s associated with eye movement, called the lateral rectus muscle. This muscle is involved in outward eye movement. For example, you would use it to look to the side. This nerve, also called the abducent nerve, starts in the pons region of your brainstem.

What is CN 3 palsy?

Lesions in the Subarachnoid space. The most common known etiology is a posterior communicating artery aneurysm. This is a medical emergency. CN III palsy without pupil involvement, as mentioned above pupillary fibers occupy a peripheral location and receive more collateral blood supply that the main trunk of the nerve.


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