Further to the dinosaurs Vaughan speaks of below, there is a Flash-based dynamic comic* at Neuroscience for Kids which is a nice intro to the entire nervous system, with Sam and his friendly neurons. In addition, there are also suggestions for a number of neuroscience-based fun lesson plans, like synaptic tag.
Sam’s brainy adventure: link
*No, a cartoon this does not make. Although action within panels, rather than dynamic transitions such as Scott McCloud’s The Right Number (click where it says to preview the work, unfortunately the full deal does cost an imposing 50c to view), does start to push the boundaries somewhat. But speech bubbles and panels maketh the medium – at least, McCloud would argue that.
Mind Hacks 