1. The Brain from Top to Bottom
This is an interactive website with lots of useful information on brain structures and their role in behaviour as varied as sleep, drug use, depression and consciousness. What is really great about this site is that it has beginner, intermediate and advanced level explanations so there is something for everyone.
2. Brain Connection
In addition to the usual links to interesting articles on brain function and anatomy, this site has links to blogs, interviews and articles by brain scientists as well as brain-teasers and quiz questions.
3. Film Demonstration of the Action Potential in Squid Axon
Get a glimpse of science in the making in this reconstruction of the famous experiment of Hodgkin and Huxley that first demonstrated the action potential (the fundamental activity of neurons).
4. The Action Potential
A short simple animation of the action potential. A great accompaniment to the section of the textbook on action potentials.