• In a case of left inferior rectus paresis, it is demonstrated that the lesion must be prenuclear. On downward gaze, the left eye, although it reached the required target with a rapid saccade, drifted back towards the midline immediately afterwards. During the drift, several corrective saccades appeared. A dissociated "gaze paretic" nystagmus resulted. Synchronously, the right eye showed an incyclorotary nystagmus. We suspect a lesion of "tonic" fibers supplying the nuclear region of the left inferior rectus and the right superior oblique muscle.
Meienberg O, Röver J, Kommerell G. Prenuclear Paresis of Homolateral Inferior Rectus and Contralateral Superior Oblique Eye Muscles. Arch Neurol. 1978;35(4):231–233. doi:10.1001/archneur.1978.00500280049009
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