I had a TON of notes on Arms and Hands, and fingers. I grabbed what I thought was most important for this tutorial. It was a pain in the butt to place things in some dicernable order, so I hope it doesn't confuse!
Thanks for posting this. Hands take a lot of practice, but it's something you need to learn if you want to draw. That goes double if you want to go pro. I heard that the legendary Jack Davis got where he is today because he was very good at drawing hands.