This site, Bio Digital Human, is a great resource for getting to know the human body from the inside. It provides a 3-D view of the body which can be rotated and zoomed into. One of the uses is to get a good visual appreciation of roughly where the important nerves run. Note that I say “roughly”, we all vary and some people have very different nerve paths so have to be assessed on an individual basis. The same site also has a more basic application, Human Body Maps.