Functional & Physiological Skeleton Model Frank on Hanging StandDesigned and developed with the help of John Chester M. D. (consultant at the Feldenkrais Guild N. A.). It features an impressive new assembly of all the joints that enable it to make individual movements that are almost true to life. Demonstrate the complex movement sequences of the upper limb. The shoulder blades twist when the arms are raised. Even the position of spoke bones and ulna in relation to each other during internal and external rotation