What replaces the footplates of Muller cells that form the inner limiting membrane at the optic disc?

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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 replaces the footplates of Muller cells that form the inner limiting membrane at the optic disc?

Explanation:
The inner limiting membrane (ILM) is mainly formed by the footplates of Müller glial cells lining the retina. But at the optic disc, where retinal nerve fibers converge to form the optic nerve, Müller cell endfeet are not the primary contributors. Instead, astrocytes that populate the optic nerve head extend to the retinal surface and form the glial boundary there. So, the structure replacing Müller cell footplates at the optic disc is formed by astrocytes. This astrocytic ILM at the disc helps support the nerve fiber exit and interfaces with the vitreous differently than the rest of the retina.

The inner limiting membrane (ILM) is mainly formed by the footplates of Müller glial cells lining the retina. But at the optic disc, where retinal nerve fibers converge to form the optic nerve, Müller cell endfeet are not the primary contributors. Instead, astrocytes that populate the optic nerve head extend to the retinal surface and form the glial boundary there. So, the structure replacing Müller cell footplates at the optic disc is formed by astrocytes. This astrocytic ILM at the disc helps support the nerve fiber exit and interfaces with the vitreous differently than the rest of the retina.

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