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. Author manuscript; available in PMC: 2012 Dec 1.
Published in final edited form as: Dev Neurobiol. 2011 Dec;71(12):1258–1272. doi: 10.1002/dneu.20926

Figure 1. Retinal circuits in Drosophila and vertebrates.

Figure 1

(A) Drosophila visual system in which photoreceptors R1–R6 project to the lamina, R7–R8 as well as lamina neurons project to specific layers of the medulla, and medulla neurons project to central targets. (B) In the vertebrate visual system, rod and cone photoreceptors in the outer nuclear layer (ONL) and bipolar cells (orange) and horizontal cells (purple) in the inner nuclear layer (INL) form synapses in the intervening outer plexiform layer (OPL). Bipolar cells and amacrine cells (blue) synapse with retinal ganglion cells (brown) from the retinal ganglion layer (RGL) in specific laminae of the intervening inner plexiform layer (IPL).