Well, to begin with, graphs are always necessary for a good presentation, mainly bar and line graphs are used, or a circle graphs, depending out what you would do. Your next best thing to put on would be a rendering of a brain or spinal cord that has scientif explanations on what happens during a stroke. Before you put it on your board make sure you are familiar with all the terms that are present on the rendering. If you mean a model, you could take a model of a brain or spinal cord and point out the sections that are effected during a stroke.
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