The Cow's Eye Dissection is one of the most popular demonstrations at the Exploratorium. For many years it has helped people satisfy their curiosity about what is inside an eye. The material presented here is meant not to replace the act of dissecting a cow's eye, but rather to enhance the experience. The images are clear and informative, but they are quite large. CDC Disease Page provides up to date and authoritative information on infectious diseases.
Information is current and there are very good links to other sites dealing with the nervous system.