Im in a sharing mood, so I thought Id show you the links that have previously helped me to understand anatomy in humans better amongst other things.
this is an incredibly good tutorial on eyes. After reading it, I tried it out and my eyes became instantly much better than they used to.
http://www.stanprokopenko.com/blog/2009/05/draw-eyes/
Here's a general anatomy article. But its really good cos the illustrations used are simple yet helpful. I also find the writing really understandable.
It's a furry tutorial though, but the thing is.. Its human-anatomy part is really great. I dunno if the furry-part is just as good cos I skipped that.
The article also touches up on the basics of drawing and such.
http://hippie.nu/~unicorn/tut/xhtml/