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Is not 0.1 mm too coarse? Neurons are much smaller. Also, I wonder what is the black hole in the middle of the left image?

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The "hole" is a part of the ventricular system that produces cerebro-spinal fluid that circulates within the brain and spinal cord.

https://en.wikipedia.org/wiki/Ventricular_system

I believe that dark area is the corpus callosum (https://en.wikipedia.org/wiki/Corpus_callosum) -- bundle of nerve fibers that connects the two hemispheres of the brain.

That is above/around the black area. The black area is the lateral ventricle. It normally contains cerebrospinal fluid, however on the image it is empty.

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