Nerves are pretty small. Consider that the human spinal cord, with its many, many nerve pathways, is under 10 mm in diameter at it widest point. Individual nerves have diameters ranging from perhaps 4 to 100 micrometers, depending on the location.
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Cranial nerve 5 is the trigeminal nerve.
You do a diameter circle!!
The trigeminal nerve is CN V (cranial nerve V)
It is half of the diameter or radius = diameter/2
The cord of a circle that contains the center of that circle is a diameter of that circle.