The intermediary tissue of Kuhnt separates which fibers?

• A. Retinal fibers from optic nerve fibers
• B. Outer nuclear fibers from inner nuclear fibers
• C. Photoreceptors from bipolar cells
• D. Ganglion cell axons from amacrine cell processes

Answer: (A)

The main idea is that Kuhnt’s intermediary tissue marks a boundary where intraretinal nerve fibers transition into the optic nerve. It lies at the border where the retinal axons from ganglion cells, still residing in the retina, become the optic nerve fibers as they exit the eye. This thin tissue acts as a separating plane between the retinal portion of the axons and the nascent optic nerve fibers, helping preserve the distinct architecture of intraretinal versus extraretinal fibers.

Other interfaces described in the retina involve different cellular layers and synaptic regions (such as photoreceptors versus bipolar cells, or ganglion cell axons versus amacrine cell processes in the inner plexiform layer) and are not the boundary referred to by Kuhnt’s intermediary tissue.