http://outreach.mcb.harvard.edu/animations/actionpotential.swf
Action Potential Animation
    Harvard University
    Clear, interactive animation illustrates resting and action potentials.
      But keep in mind that the negative signs shown inside (& later outside)
      the cell do NOT represent negative ions, but only that that side is
      LESS POSITIVE than the other!

http://www9.biostr.washington.edu/da.html
Brain Anatomy
    University of Washington, Seattle
    Interactive images of brain structures and functions.

BrainConnection.com
A useful, user-friendly site with illustrated reviews of anatomy and
    neural functioning in several systems, including development, vision,
    audition, motor processes, etc. Includes a glossary of relevant terms,
    and some interactive video.

The Society for Neuroscience
News, publications, neuroscience database, research and educational
    opportunities, links to additional resources, etc.

WebVision
John Morgan Eye Center, University of Utah
    Detailed, advanced descriptions of the anatomy and functioning of the
    visual system, including diagrams, photos, and video.