The retina is composed of different layers of different types of neurons, such as the receptors, horizontal cells, bipolar cells, amacrine cells, and ganglion cells.
Cells in different layers are synaptically connected in the two plexiform layers. In the outer plexiform layer (towards the back of the eye), both the bipolar and horizontal cells make their contacts to the receptors (cones and rods), while in the inner plexiform layer (towards the front of the eye), the bipolar cells and the amacrine cells are connected to the ganglion cells.
