Which of the following lists the three major vascular layers of the choroid?

• A. Haller's layer; Sattler's layer; Choriocapillaris
• B. Choroid proper; Retina; Sclera
• C. Fornix; Sclera; Lamina
• D. Choriocapillaris; Retinal nerve fiber layer; Ganglion cells

Answer: (A)

The choroid’s vascular organization consists of three layers from outer to inner: Haller's layer with the large vessels, Sattler's layer containing the medium-sized vessels, and the choriocapillaris, a dense network of capillaries just internal to Bruch's membrane and right next to the outer retina. This inner-capillary layer is crucial for delivering oxygen and nutrients to the photoreceptors and RPE.

Why this set is correct: it names the three vascular strata that make up the choroid, reflecting its function as the primary blood supply to the outer retina. The other options mix in non-vascular tissues (retina, sclera) or non-choroidal structures, which do not describe the choroid’s vascular organization.