Electron Microscopic Analysis of Myelin Damage in a Rat Model of Optic Nerve Injury

0 weergaven1:25 min • March 4th, 2025

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Take fixed optic nerve sections from a control rat and a rat with optic nerve injury.

The control section exhibits axons with tightly packed myelin sheaths containing concentric plasma membrane layers. The injured section exhibits decompacted myelin with large gaps.

Incubate with an osmium-ferrocyanide complex that binds to lipids and enhances the myelin sheath's contrast.

Treat with thiocarbohydrazide to create additional binding sites for osmium.

Reapply osmium to further enhance lipid contrast.

Stain with heavy metals, which bind to macromolecules and enhance structural contrast.

Dehydrate using increasing alcohol concentrations and rinse with acetone for resin embedding.

Embed the tissue in resin, and coat the resin with gold to improve image quality.

Use serial block-face scanning electron microscopy to simultaneously slice and image. Focus the electron beam on the surface and detect the backscattered electrons to generate images.

Myelin sheaths appear dark, while spaces within damaged sheaths appear lighter, allowing differentiation between normal and damaged myelin.

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Laatst bijgewerkt: 1 augustus 2026