The ILM over the optic nerve is formed by which type of cells?

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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

The ILM over the optic nerve is formed by which type of cells?

Explanation:
The boundary at the inner surface of the retina is the inner limiting membrane (ILM). In most of the retina, this membrane is formed by the endfeet of Müller cells, which lay down a basement membrane that becomes the ILM. However, at the region over the optic nerve head, Müller cells are not responsible for forming the ILM. Instead, astrocytes surround the optic nerve and their endfeet contribute to the ILM in this area, creating the glial boundary between the retina and the vitreous. So, the ILM over the optic nerve is formed by astrocytes. Oligodendrocytes and microglia do not form the ILM.

The boundary at the inner surface of the retina is the inner limiting membrane (ILM). In most of the retina, this membrane is formed by the endfeet of Müller cells, which lay down a basement membrane that becomes the ILM. However, at the region over the optic nerve head, Müller cells are not responsible for forming the ILM. Instead, astrocytes surround the optic nerve and their endfeet contribute to the ILM in this area, creating the glial boundary between the retina and the vitreous. So, the ILM over the optic nerve is formed by astrocytes. Oligodendrocytes and microglia do not form the ILM.

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