Where is the choroid thinnest?

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Prepare for the NBEO Ocular Anatomy Posterior Segment and Cranial Nerves Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Where is the choroid thinnest?

Explanation:
Thickness of the choroid varies across the posterior segment. It is thickest beneath the posterior pole to meet the high metabolic needs of the photoreceptors there, especially under the fovea. As you move toward the anterior edge of the retina, the choroid progressively thins and reaches its minimum at the ora serrata, where the retina ends and the choroidal tissue tapers toward the sclera. This makes the ora serrata the thinnest region.

Thickness of the choroid varies across the posterior segment. It is thickest beneath the posterior pole to meet the high metabolic needs of the photoreceptors there, especially under the fovea. As you move toward the anterior edge of the retina, the choroid progressively thins and reaches its minimum at the ora serrata, where the retina ends and the choroidal tissue tapers toward the sclera. This makes the ora serrata the thinnest region.

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