This is a X-Ray skeleton system using mental ray shaders. The MR shaders give a much more pleasing effect then similar models that do a simple standard falloff.
The scene is rendered low resolution intentionally to make it look exactly like what a real xray image might look like taken from a medical facility. It can be rendered from any angle to simulate an xray image from different parts of the body.
The scene comprises of an entire skeletal system as well as a highly detailed human body. The human body is built using quads for easy rigging and animation.
Anyone who has ever tried modeling a full skeleton knows the amount of work and precision needed to model every bone precisely. This is a great model for those tight turn around times when you need something that is high quality as well.