Figure 3.

Map of RB synapses. A total of 174 rods synaptically converged to AII amacrine cell 3 through nine RB cells. The rods are shown divided into four groups: 1) 41 rods converging through a pair of Rbs, 2) 124 rods converging through one of the nine RB cells and one more RB cell outside the group of nine (not shown) or a type 7 On cone bipolar cell (asterisk), 3) three rods converging through the invaginating double dendrite of an RB cell (at RB14, 17, and 22), and 4) six rods converging through the Y-shaped RB invaginating dendrite (at RB16, 19, 20, and 21). The dotted contours in different colors indicate the dendritic fields of the nine RB cells (RB14–22). A bar of each color represents one of the RB invaginating dendrites. The number of rods converging onto each RB cell ranges from 24 to 27, with an average of 25, except for RB15 in the upper left, for which only 15 bars are shown because the others were not reconstructed (outside the series). Scale bar = 5 μm.