Introducing Fred, the flexible skeleton model. Fred's spine can bend to mimic any natural human movement. Once flexed, this human skeleton model will remain fixed in position to demonstrate correct and incorrect posture or various pathological conditions. In addition, all skull and neck movements can be demonstrated. Spinal nerve exits and vertebral arteries are shown as is a dorso-lateral disc prolapse between the 3rd and 4th lumbar vertebrae. This 3B Scientific human skeleton replica moves just like the real thing.