great X-ray bone footage in motion

Here is great X-ray bone footage in motion. Usefull for rigging, but for artists and modellers/ sculptors as well:

http://www.iflscience.com/health-and-medicine/amazing-x-ray-gifs-show-joints-motion

check out these videos too:
http://vimeo.com/4683942
http://vimeo.com/5397933