Each one of those small black spheres is the cell body of a motor neuron. The lines extending into the center are the axons. You can’t see them go all the way out the nerve because this piece of nervous system is thick enough that the microscope doesn’t have enough depth of field to focus on everything you’d like to see at once.
This is a very good example of a technique called cobalt backfilling. The editor for one of my papers called this technique “old-fashioned,” but so what? I can see everything I need.
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