Photomicrographs of BDA labeled reticulotectal neurons (A–E,G&H) and tectoreticular axons (A–H) in the cat. Numerous close associations between labeled boutons and cells (arrowheads) were observed in many cases (A–E). However, in other cases, only a few such associations were observed (G&H). Labeled axons (arrows) also displayed terminal boutons located in the neuropil that had no association with labeled elements (G&H) or with counterstained, unlabeled somata (F). Scale bar = 10 μm. The number of z-axis planes combined to make plate A–C=1, D=8, E=4, F=5, G=9, H=7.