Fig. 9. Dynamics of forelimb motion in the cui (Galea musteloides). For seven evenly distributed events during the stance phase, the figure illustrates: the (reactive) net joint forces as vectors; the net joint torques as circle segments, virtually attached to the segment distal of the joint and indicating the rotational tendency by its orientation relative to the segment; and the length of the muscle bellies of M. triceps brachii relative to their length at touch down.