Fig. 4.
Representative digital photomicrographs showing bilateral cannula placement in the deep layers of the superior colliculus/mesencephalic reticular formation (deep SC/Me;A) and superficial layers of the superior colliculus (super SC; B). Shaded areas in thelower panels summarize the location of cannulas in the deep SC/Me and super SC from animals used in this study. Serial plates are from the atlas of Paxinos and Watson (1997) and are listed in millimeters posterior to bregma. Scale bar, 2 mm.