Outer blood-retinal barrier is formed by tight junctions in which structure?

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Enhance your NBEO Histology Test preparation skills with our quiz. Dive into multiple choice questions explained with hints and detailed answers. Ace your NBEO exam with confidence!

Multiple Choice

Outer blood-retinal barrier is formed by tight junctions in which structure?

The outer blood-retinal barrier is formed by tight junctions in the retinal pigment epithelium. The RPE sits between the photoreceptors and the choroid, and its apical tight junctions seal the space between neighboring RPE cells, preventing unregulated diffusion from the choroidal blood into the retina. This creates the outer barrier that maintains the retinal environment essential for photoreceptor function. By contrast, the inner barrier is formed by tight junctions in the retinal capillary endothelium, which restricts access from the bloodstream into the neural retina. Desmosomes in the sclera and gap junctions in the retina don’t create this barrier function.

Outer blood-retinal barrier is formed by tight junctions in which structure?

Enhance your NBEO Histology Test preparation skills with our quiz. Dive into multiple choice questions explained with hints and detailed answers. Ace your NBEO exam with confidence!

Outer blood-retinal barrier is formed by tight junctions in which structure?

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