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Where is the neuron cell body? Would they be at the outside where the fibers (axons?) seem to terminate?

I wouldn't have guessed that it would look so linear. I was expecting a much more tangled appearance.

The tangled part is actually mostly 2mm thickness on the surface[0]. That's why the folds matter so much:

Check out this article for a pretty cool overview of the brain: https://waitbutwhy.com/2017/04/neuralink.html

Thank you! Great links.