FIGURE 4

FIGURE 4

Orientation-tuned amacrine cells in rabbit and zebrafish. (A) Planar dendritic morphology of the two classes of orientation-tuned amacrine cells found in the rabbit retina by Bloomfield (1991, 1994). ‘Orientation-selective’ amacrine cells have a circular dendritic field (left). ‘Orientation-biased’ amacrine cells are characterized by a highly elongated dendritic field (right). Schematic representations of the corresponding receptive fields are overlaid on top of the dendritic arbors. ‘+’ and ‘–’ symbols indicate excitatory and inhibitory inputs, respectively. Images taken from Bloomfield (1994) with permission. (B) Planar dendritic morphology of the two types of orientation-tuned amacrine cells found in the larval zebrafish retina by Antinucci et al. (2016b). Note the high degree of dendritic elongation similar to that observed in rabbit ‘orientation-biased’ amacrine cells. The color coding of neurites indicates the different IPL laminae they are located. Black and magenta lines indicate neurites in OFF and ON laminae, respectively. Images taken from Antinucci et al. (2016b) with permission.