Which structure is the middle, vascular layer of the eye between the retina and the sclera?

Which structure is the middle, vascular layer of the eye between the retina and the sclera?

• A. Choroid
• B. Aqueous humor
• C. Vitreous humor
• D. Optic disk (papilla)

Answer: (A)

In the eye, the middle layer that is rich in blood vessels and lies between the retina and the sclera is the choroid. Its vascular network nourishes the outer retina (where the photoreceptors reside) and its pigmented cells help absorb stray light. The other options aren’t between the retina and sclera: aqueous humor is a fluid in the anterior chamber, vitreous humor is a gel filling the posterior segment behind the lens, and the optic disk is a retinal spot where the optic nerve exits. So the structure that matches the description is the choroid.

In the eye, the middle layer that is rich in blood vessels and lies between the retina and the sclera is the choroid. Its vascular network nourishes the outer retina (where the photoreceptors reside) and its pigmented cells help absorb stray light. The other options aren’t between the retina and sclera: aqueous humor is a fluid in the anterior chamber, vitreous humor is a gel filling the posterior segment behind the lens, and the optic disk is a retinal spot where the optic nerve exits. So the structure that matches the description is the choroid.