Hi,
I think we are talking about two different things here.
Central nerve cells do not regenerate, once the body cell is
damaged, it inevitably degenerates, the cell dies and is never
replaced.
However it is a well known fact that the myelin sheath of
"peripheral nerve cells" can "sometimes" regenerate at a very slow
pace if damaged.
The cause of multiple sclerosis is unknown but it is believed to be
an autoimmune disorder in which the body defense system mistakes
the myelin sheath as a foreign element and attacks and destroys it.
Again, peripheral nerve cells can SOMETIMES regenerate,
central nerve cells DO NOT regenerate.
regards,
peace
Mario