Schematic representation of a sagittal section of the brainstem showing the location of the important structures involved in eye movements. The shaded areas indicate the paramedian pontine reticular formation (PPRF). The DLPN are not visible because this illustration is a midsagittal section and the DLPN is laterally located; it is best visualized on an axial view through the rostral pons. INC = interstitial nucleus of Cajal; MLF = medial longitudinal fasciculus; MRF = mesencephalic reticular formation; NPH = nucleus prepositus hypoglossi; PC = posterior commissure; riMLF = rostral interstitial nucleus of MLF.