Fig. 16. Path of the centroid of the lateral rectus (LR) muscle from the orbital apex toward the insertion, in primary gaze, elevation, and depression. Zero on the abscissa corresponds to globe center. There is a discrete inflection in the extraocular muscle path at the pulley, which corresponds to the inflection seen in the superimposed axial image of the LR (arrow), scaled identically on the anteroposterior axis. (Data from Robert A. Clark, MD, and the author.)