Comments

dxdy wrote on 12/15/2011, 12:19 PM
It looks to me like the medical one was a series of stills taken of a skilled artist drawing on a whiteboard. There are shadows of the arm and hand all over.

The second one looks like an animated arm.

In either case, you could have the images drawn and photographed, then import them as an image sequence, then chromakey an arm/hand and lay it over that. It all sounds like a lot of work.
OhMyGosh wrote on 12/16/2011, 12:06 AM
I would film the drawing, speed it up, do a voice over, that simple. Cin
Jim-R wrote on 12/16/2011, 6:35 AM
It could have been made as a screen video grab using a wacom Cintic screen digitzer for the drawing, then adding the artificial hand afterwards.

JimR