Which statement correctly describes the retina layers from outer to inner and a cell type found in each layer?

Which statement correctly describes the retina layers from outer to inner and a cell type found in each layer?

• A. Outer Plexiform Layer Contains Photoreceptors; Inner Nuclear Layer Contains Amacrine Cells; Ganglion Cell Layer Contains Retinal Ganglion Cells.
• B. Inner Nuclear Layer Contains Photoreceptors; Outer Nuclear Layer Contains Bipolar Cells; Nerve Fiber Layer Contains Retinal Ganglion Cells.
• C. Ganglion Cell Layer Contains Photoreceptors; Inner Nuclear Layer Contains Ganglion Cells; Outer Nuclear Layer Contains Bipolar Cells.
• D. Outer Nuclear Layer Contains Photoreceptors; Inner Nuclear Layer Contains Bipolar Cells; Ganglion Cell Layer Contains Retinal Ganglion Cells.

Answer: (D)

The retina is organized so that the cell bodies of different neuron types sit in specific layers, with the surrounding layers hosting their connections. Photoreceptors (rods and cones) have their cell bodies in the outer nuclear layer, while their light-detecting outer segments reach toward the pigmented epithelium and their signals connect to bipolar and horizontal cells in the outer plexiform layer. The inner nuclear layer houses the cell bodies of bipolar cells, as well as horizontal and amacrine cells that help process signals before they reach the ganglion cells. The retinal ganglion cells have their cell bodies in the ganglion cell layer, and their axons form the nerve fiber layer as they head toward the optic nerve. So, the arrangement described—outer nuclear layer with photoreceptors, inner nuclear layer with bipolar cells, and ganglion cell layer with retinal ganglion cells—matches the true organization. The other statements misplace cell bodies or identify layers by the wrong cell types (for example, photoreceptors do not have their cell bodies in the outer plexiform layer, and ganglion cells do not reside in the nerve fiber layer).

The retina is organized so that the cell bodies of different neuron types sit in specific layers, with the surrounding layers hosting their connections. Photoreceptors (rods and cones) have their cell bodies in the outer nuclear layer, while their light-detecting outer segments reach toward the pigmented epithelium and their signals connect to bipolar and horizontal cells in the outer plexiform layer. The inner nuclear layer houses the cell bodies of bipolar cells, as well as horizontal and amacrine cells that help process signals before they reach the ganglion cells. The retinal ganglion cells have their cell bodies in the ganglion cell layer, and their axons form the nerve fiber layer as they head toward the optic nerve.

So, the arrangement described—outer nuclear layer with photoreceptors, inner nuclear layer with bipolar cells, and ganglion cell layer with retinal ganglion cells—matches the true organization. The other statements misplace cell bodies or identify layers by the wrong cell types (for example, photoreceptors do not have their cell bodies in the outer plexiform layer, and ganglion cells do not reside in the nerve fiber layer).