Which statement correctly describes the outer blood-retinal barrier?

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Study for the NBEO Ocular Anatomy Posterior Segment and Cranial Nerves Test. Use flashcards and multiple choice questions, complete with hints and detailed explanations. Prepare effectively for your exam!

Multiple Choice

Which statement correctly describes the outer blood-retinal barrier?

The outer blood-retinal barrier is formed by tight junctions between adjacent retinal pigment epithelium (RPE) cells at their apical surface, facing the photoreceptors. These apical tight junctions seal the RPE layer and prevent paracellular movement of fluids and solutes from the choroid into the subretinal space, while still allowing the RPE to actively transport nutrients and ions to support the photoreceptors. The basal side of the RPE contacts Bruch's membrane, but the barrier function specifically comes from the apical tight junctions. In contrast, the inner blood-retinal barrier is created by tight junctions between retinal capillary endothelial cells, not the RPE. Therefore, describing the outer barrier as formed by apical RPE tight junctions accurately captures its location and mechanism.

Which statement correctly describes the outer blood-retinal barrier?

Study for the NBEO Ocular Anatomy Posterior Segment and Cranial Nerves Test. Use flashcards and multiple choice questions, complete with hints and detailed explanations. Prepare effectively for your exam!

Which statement correctly describes the outer blood-retinal barrier?

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