Reflex vertical gaze and the medial longitudinal fasciculus

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Abstract
Extraocular movements were investigated in a patient with bilateral vascular lesions of the medial longitudinal fasciculus. The patient showed voluntary and reflex horizontal gaze consistent with his lesion, but had absent reflex vertical gaze. Voluntary vertical gaze was present. Necropsy was performed, and the medial longitudinal fasciculi in the pons may convey impulses for reflex vertical gaze, but are not required for voluntary vertical gaze.