Many rods synapse with biopolar cells, which in turn synapse with amacrine cells. These cells form connections with cone bipolar cells, which in turn synapse with retinal ganglion cells that form the optic nerve. This example illustrates the general principle known as

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Convergence refers to the process where multiple input signals (in this case, from many rods) come together to synapse onto a smaller number of neurons (bipolar cells, then onto ganglion cells). This is a key feature of the visual system, particularly in the rod system, allowing for the summation of signals which enhances sensitivity to light.

Many Rods Synapse with Biopolar Cells, Which in Turn Synapse