Add/Insert Extra Bones & Improve Joint Bending
http://www.youtube.com/watch?v=2hlDO6M7NFg
This is a continuation of the "Add Ears, Feet & Hands to Our Animated Character" tutorial. See the playlist for this series of tutorials: http://www.youtube.com/playlist?list=PL-Jnd67hUQS8WaOCWJ7JrmjTN9dvMMe5u