Which layer lies closest to the sclera and contains the largest choroidal vessels?

Which layer lies closest to the sclera and contains the largest choroidal vessels?

• A. Haller's layer
• B. Sattler's layer
• C. Choriocapillaris
• D. Suprachoroid lamina

Answer: (A)

Understanding how the choroid’s blood vessels are organized helps answer this. The choroid has three vascular layers arranged from outer to inner: the outermost layer contains the largest-caliber vessels, the middle layer has medium-sized vessels, and the innermost layer is the choriocapillaris. The largest vessels sit closest to the sclera, in Haller's layer. The suprachoroidal lamina lies outside the choroid, between sclera and choroid, and does not contain these choroidal vessels. So the layer nearest the sclera that houses the largest choroidal vessels is Haller's layer.

Understanding how the choroid’s blood vessels are organized helps answer this. The choroid has three vascular layers arranged from outer to inner: the outermost layer contains the largest-caliber vessels, the middle layer has medium-sized vessels, and the innermost layer is the choriocapillaris. The largest vessels sit closest to the sclera, in Haller's layer. The suprachoroidal lamina lies outside the choroid, between sclera and choroid, and does not contain these choroidal vessels. So the layer nearest the sclera that houses the largest choroidal vessels is Haller's layer.