Fig. 1

EM volume data from the ventro-temporal anchovy retina. A Cropped volume of Apreo scan 2 from horizontal cell dendrites (top) to scleral-most bipolar cell nuclei (bottom) represented by three orthogonal planes: XY front (cutting plane), YZ left, XZ top, inverted grayscale. Levels of digital reslices C–F indicated by c–f. B Volume rendering of A, highlighting less electron-dense structures, conveys the three-dimensionality of the structural data, especially at the level of the H3 cells. C XZ plane at the level of H1 cells. Nuclei surrounded by electron light cytoplasm. Between the lobed H1 profiles dendrite bundles of H2, H3, and BCs are seen. Arrowheads: neighboring H1 cells are connected by gap junctions. D XZ plane at the level of H2 cells. The space between the lobed H2 profiles is filled by dendrite bundles of H3 and BCs. Arrowheads: neighboring H2 cells are connected by gap junctions. E XZ plane at the level of H3 cells. F XZ plane (slightly oblique) at the level of horizontal cell axon terminals and bipolar nuclei. Arrowheads: neighboring H1 ATs are connected by gap junctions. # cone pedicles, B bipolar cell nucleus, b dendrite bundles of BCs, H1/2/3 horizontal cell type 1/2/3, * horizontal cell type 3, H1 AT horizontal cell type 1 axon terminal, mb Müllerband. Scale bars: A 10 µm (also B); F 10 µm (also C–E)