Fig. 3

H1 axons with axon terminals, H2 axons. A Oblique view of the H1 axon terminal layer (in blue and green colors, by chance with a central hole formed by slightly displaced b-cells) with two reconstructed H1 cell somata (Apreo scan 1). * Axon terminal of yellow soma (see also Fig. 2D, E), B bipolar cell nucleus, cp cone pedicle, H1/2/3 horizontal cell type 1/2/3. B Horizontal view of the dense H1 axon terminal layer (with tiny holes for bipolar dendrite bunches) overlayed by H1 nuclei (semitransparent blue), ¼ of the stitched area of scan 4b, i.e., 1 tile of 4. C Apreo scan 2. H1 axons in warm colors (yellow to red, two completely reconstructed, the rest as skeletons, five reaching the H1 somata) and H2 axons in cold colors (green, blue, pink; skeletons with indicated varicosities). Labels as in A + HAT horizontal cell (type 1) axon terminal, OPL outer plexiform layer. D Volume rendering of the same data clipped by an oblique cutting plane just below the H2 somata showing H2 axons (arrowheads), partly as surface renderings. B bipolar cell, H3 horizontal cell type 3, HAT horizontal cell (type 1) axon terminal. Scale bars: A 20 µm; B–D 10 µm