My central nervous system is a tree

I drew a little cartoon of my brain and spinal cord today and was shocked to see that I had drawn a tree with roots.

At the moment, the bark of my spine-tree has been damaged at a point on the trunk, as though a deer has nibbled its way around it, or a kid has had a go with a penknife. How many roots have withered for lack of the juicy brain impulses that can’t get past the ring-barked part of the cord? And what about the stuff coming up from the leg-roots – what happens to that?

How long does it take for bark to grow back?

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