Which of the following is NOT true regarding the choriocapillaris?

• A. It is primarily regulated by sympathetic innervation
• B. It supplies blood to the outer retina
• C. It is a large bed of non-fenestrated capillaries
• D. It provides nourishment to the macula via SPCAs

Answer: (C)

The choriocapillaris is a dense, wide bed of capillaries in the choroid lying directly beneath Bruch’s membrane to supply the outer retina, especially the photoreceptors. Its capillaries are fenestrated, not non-fenestrated, which allows plasma and nutrients to pass readily from the blood to the outer retina and RPE. This network is fed by the short posterior ciliary arteries, with their branches forming the choriocapillaris that nourishes the macula as well. Autonomic control modulates choroidal blood flow, with sympathetic innervation causing vasoconstriction to adjust perfusion. So the statement about it being a large bed of non-fenestrated capillaries is not true, while the others align with its known structure and function.