What is the Outer Plexiform Layer primarily the interface between?

What is the Outer Plexiform Layer primarily the interface between?

• A. Bipolar cells and photoreceptors
• B. Ganglion cells and amacrine cells
• C. Retinal pigment epithelium and photoreceptors
• D. Blood vessels and neurons

Answer: (A)

The outer plexiform layer is where the first neural contacts of vision occur: photoreceptors form synapses with the next set of neurons, primarily bipolar cells, while horizontal cells provide lateral modulation. This is the main doorway through which signals from rod and cone photoreceptors are handed off to the bipolar pathway that carries information deeper into the retina. So, the interface is between photoreceptors and bipolar cells (with horizontal cells helping modulate the signal). The other described interfaces occur in different parts of the retina: inner plexiform layer handles connections between bipolar, amacrine, and ganglion cells; the retinal pigment epithelium–photoreceptor interaction is at a different boundary outside this layer; and blood vessels aren’t neural synapses.

The outer plexiform layer is where the first neural contacts of vision occur: photoreceptors form synapses with the next set of neurons, primarily bipolar cells, while horizontal cells provide lateral modulation. This is the main doorway through which signals from rod and cone photoreceptors are handed off to the bipolar pathway that carries information deeper into the retina. So, the interface is between photoreceptors and bipolar cells (with horizontal cells helping modulate the signal). The other described interfaces occur in different parts of the retina: inner plexiform layer handles connections between bipolar, amacrine, and ganglion cells; the retinal pigment epithelium–photoreceptor interaction is at a different boundary outside this layer; and blood vessels aren’t neural synapses.