How cranial nerves assist in localizing brain stem lesions

How cranial nerves assist in localizing brain stem lesions

How can understanding the anatomy and function of individual cranial nerves assist in localizing brain stem lesions? 

The relatively compact positioning of the cranial nerve nuclei and their intramedullary nerve fibers at specific levels, as well as their proximity to certain vertically directed fiber tracts, create a series of anatomic patterns that provide a basis for the localization of brain stem lesions.

Generally speaking, the motor nuclei of the cranial nerves are situated medially, the spinothalamic fibers run along the dorsal lateral portion, and the corticospinal fibers run along the ventral portion of the brain stem.

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