CranialNerves

This excerpt comes from a neuro-ophthalmology lecture from Ophthobook.com. Fourth nerve palsies effect the superior oblique muscle (trochlea).  

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Basic overview of the cranial nerves anatomy and function  

All you need to know about Cranial Nerves in one spreadsheet  

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Learn how to examine the cranial nerves with key facts and landmarks explained and highlighted.  

 

Ptosis is the lagging of an eyelid. It has 2 distinct etiologies. Sympathetics going to the eye innervate Muller's muscle, a small muscle that elevates the eyelid. The III cranial nerve also innervates a much larger muscle that elevates the eye lid: the levator palpebrae. Thus, disruption of either will cause ptosis. The ptosis from a III nerve palsy is of greater severity than the ptosis due to a lesion of the sympathetic pathway, due to the size of the muscles innervated. As an aside, the parasympathetics run with the III cranial nerve and are usually affected with an abnormal III cranial nerve.  

 

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Dr. Fabian explaining the cranial nerves  

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