Injury Map

I wish I had a clearer memory of what this was all about. It seems to have something to do with some sort of Fantastic Voyage scenario, but it also seems to depict some sort of giant with roads (note the center lines) and buildings inside it (or, alternately, a city in the outline of a human figure). Whichever way you interpret it, it appears that vehicles pass in and out of it through a tunnel in the butt.
Incidentally, this is the front and back of one sheet of paper.