[Neuroscience] Free pictures of rat brain/hippocampus?

[Mathias]

Dear ng,

I'm looking for some illustrations of the rat brain in total and the 
hippocampal formation to use for my PhD thesis.
All the typical images I found on the web are copyrighted or unlabelled 
(content, source). I understand that figures from PLoS publications are 
under the Creative Commons License but there are no such images I need yet.

Thanks for suggestions,
    Mathias