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

As shown in Figure 8, these observations lead to the hypothesis that two major processing streams are involved in visually guided saccadic eye-movement generation, the anterior and the posterior. The posterior system, originating the occipital and parietal cortices send their prime signal for saccade generation through the superior colliculus. The anterior system, originating in the frontal and medial eye fields, has direct access to the brainstem. The anterior system receives profuse projections from many other cortical areas including the parietal lobe. Interconnections among the structures of the anterior and posterior systems assure that eye movements are generated cohesively.