Side and top views of 20 T4 dendrites contacting a single column. Upper panel (side view): the terminals of a single Mi9 and Mi1 in the central column (column 1) are depicted. Lower panel (top view): dotted circular lines outline each medulla column. A single T4 dendrite is highlighted in red. Mi1 and Mi9 neurons in columns surrounding column 1 are shown in a slightly weaker shading than in column 1. The patterns of synaptic inputs to different T4s from Mi9 and Mi1 neurons in column 1 are shown in (B) and (C). EM data in (A)–(C) from Takemura et al.7
