I. Supranuclear Pathway

lated by a high level of coordination between sensory and motor functions which center stationary or moving objects in the central retina (fovea). The securing and stabilization of object images on the fovea during head movement are the basic functions of eye movements (1). Recent advances in the techniques of magnetic resonance (MR) imaging have opened a new horizon for the evaluation of ocular motility disorders; pathologies once considered beyond the scope of imaging are now frequently visualized. Knowledge of the basic pathway and physiology involved in eye movement provides a better understanding of the ocular motility disorders. The supranuclear control of eye movement involves the pathway extending from the cerebral cortex to the ocular motor nuclei located in the brain stem. In this paper, in addition to describing the normal supranuclear pathway of eye movement, we demonstrate MR imaging findings of the typical ocular manifestations caused by disorders involving the supranuclear pathway, providing the anatomic explanations for certain clinical signs.