The Neural Control of Visually Guided Eye Movements
C. Cortical Mechanisms of Visually Guided Saccadic Eye Movements

How do the signals from the various cortical areas reach the brainstem oculomotor centers? As shown in Figure 7, removal of the superior colliculus eliminates electrically elicited saccades from posterior cortex but does not affect saccades elicited from the frontal and medial eye fields. Furthermore, lesions of the superior colliculus cause only modest deficits in visually guided saccadic eye movements.