Which layer contains the majority of the cell bodies of the photoreceptors?

The majority of the cell bodies of the photoreceptors are found in the inner nuclear layer of the retina. This layer is critical as it houses various types of neurons, including the bipolar cells, horizontal cells, and the cell bodies of the photoreceptors themselves—rods and cones.

In the retina, photoreceptors are specialized neurons that transduce light into neural signals, and their outer segments are located in the photoreceptor layer, which is external to the inner nuclear layer. However, the cell bodies reside within the inner nuclear layer, making this layer key for understanding the organization of the retinal structure.

The retinal pigment epithelium is a layer that provides support and nourishment to the photoreceptors but does not contain their cell bodies. The photoreceptor layer includes the outer segments of the photoreceptors but not their cell bodies. The retinal nerve fiber layer consists primarily of the axons of ganglion cells, which is also distinct from where the photoreceptor cell bodies are located. Therefore, the inner nuclear layer is indeed where the majority of these cell bodies are found.