Muscular system notes

I found these notes that give a good explanation of flexors, extendors, and other muscle bone interactions.
http://library.thinkquest.org/2935/Natures_Best/Nat_Best_Low_Level/Muscular_page.L.html

Here is a cool site for identifying even the little muscles we aren't studying.
http://www.innerbody.com/image/musfov.html

Wiki pedia also has lots of anatomy links and information.
http://en.wikipedia.org/wiki/Muscular_system