I found this really informative page on betta anatomy that explains the different parts and functions and even has a diagram. Thought it would be helpful
http://www.swishfish.com/anatomy.shtml
Full Version: Good Betta Info On Anatomy
A very useful resource Kris, thankyou! 
Thnaks MrBumblebee. I love this diagram, it has a pic of the fishes brain. The articles on the different parts are pretty informational.
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