Black and White films of moving anatomy

I can't embed these videos becuase they're lisensed by Getty images, but I can at least provide a link:

http://video.google.com/videoplay?docid=7928381862503591651&ei=buleSLeVBJaMrgOM77yKDg&hl=en

It's x-ray clips of bones moving within the human body. The ones on feet are amazing. Does anyone know where they're from?