What is the third layer from the choroidal side in Bruch's membrane?

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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

What is the third layer from the choroidal side in Bruch's membrane?

Explanation:
From the choroid toward the retina Bruch's membrane has a fixed five-layer sequence: basement membrane of the choriocapillaris, outer collagenous layer, elastic layer, inner collagenous layer, and basement membrane of the retinal pigment epithelium. The elastic layer sits third in this order, between the two collagenous layers. This placement explains why the third layer from the choroidal side is the elastic layer. The other layers correspond to the first (choriocapillaris basement membrane), second (outer collagenous), fourth (inner collagenous), and fifth (RPE basement membrane) positions along the same axis.

From the choroid toward the retina Bruch's membrane has a fixed five-layer sequence: basement membrane of the choriocapillaris, outer collagenous layer, elastic layer, inner collagenous layer, and basement membrane of the retinal pigment epithelium. The elastic layer sits third in this order, between the two collagenous layers. This placement explains why the third layer from the choroidal side is the elastic layer. The other layers correspond to the first (choriocapillaris basement membrane), second (outer collagenous), fourth (inner collagenous), and fifth (RPE basement membrane) positions along the same axis.

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