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To illustrate the nervous system, draw a vector human figure facing forward, showing the entire body from head to toe. Use a filled-in outline to represent the human body. Within this outline, depict the brain connected through the brainstem to the spinal cord. From the spinal cord, draw nerves extending throughout the whole body.
Use color to visually emphasize the important fact that the right hemisphere of the brain controls the left side of the body, and the left hemisphere controls the right side. For example, you might color the right hemisphere and the left side nerves in one color (like blue), and the left hemisphere and the right side nerves in another color (like red).
This approach helps show the cross-communication between the brain and the body in an intuitive way.