Which are the primary cellular layers of the retina?

Which are the primary cellular layers of the retina?

• A. Inner plexiform layer, outer plexiform layer
• B. Ganglion cell layer, inner nuclear layer, outer nuclear layer
• C. Photoreceptor layer, ganglion layer, bipolar layer
• D. Cornea, sclera, choroid

Answer: (D)

The retina’s neurons are organized into three main layers that contain their cell bodies. The outer nuclear layer houses the cell bodies of the photoreceptors (rods and cones). The inner nuclear layer contains the cell bodies of interneurons like bipolar cells, horizontal cells, and amacrine cells, which shape and relay signals within the retina. The ganglion cell layer holds the cell bodies of retinal ganglion cells, whose axons bundle together to form the optic nerve and carry visual information to the brain. The inner and outer plexiform layers are synaptic zones where these cells connect, not layers with neuronal cell bodies. The other options describe layers that are either synaptic regions or structures outside the retina, so the three cellular layers listed are the correct set.

The retina’s neurons are organized into three main layers that contain their cell bodies. The outer nuclear layer houses the cell bodies of the photoreceptors (rods and cones). The inner nuclear layer contains the cell bodies of interneurons like bipolar cells, horizontal cells, and amacrine cells, which shape and relay signals within the retina. The ganglion cell layer holds the cell bodies of retinal ganglion cells, whose axons bundle together to form the optic nerve and carry visual information to the brain. The inner and outer plexiform layers are synaptic zones where these cells connect, not layers with neuronal cell bodies. The other options describe layers that are either synaptic regions or structures outside the retina, so the three cellular layers listed are the correct set.