I have no lesions in my neck, but several in my brain, and have a lot of facial
numbness as well as optic neuritis. My
numbness extends down my neck on the right side,
and all the way down my back - tapering off at the lumbar. It's possible I have lesions in the spine, but it hasn't been verified.
There's a lot of nerves in the skull area - many people with MS present with facial paresthesia as their first symptom. I guess MS finds it easier to get to the head first.