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A neuron is tiny. A part inside a transistor can be much tinier!
400 of these channel lengths fit across this cell body.
Both bars use the same scale. Slide to see the tiny green bar.
Illustrative physical lengths: a 20 µm neuron cell body (not its long branches) and a 50 nm silicon transistor channel (not the whole transistor). 50 nm = 0.05 µm; 20 ÷ 0.05 = 400. Sizes vary. These are physical dimensions, not chip process names.
University of Washington: neuron body sizes · Clément et al.: measured 50 nm channel