Which structure is stained blue in the image, indicating the myelin sheath?

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Multiple Choice

Which structure is stained blue in the image, indicating the myelin sheath?

Explanation:
The blue staining highlights the myelin sheath because Luxol fast blue specifically binds to the lipid-rich components of myelin. The myelin wraps around axons, so in sections stained this way you see blue rings or sheaths surrounding the axon cores. The axons themselves take up the counterstain and appear in a different color, while nuclei and connective tissue stain according to their respective components in the chosen stain. So the blue structures indicate the myelin sheaths.

The blue staining highlights the myelin sheath because Luxol fast blue specifically binds to the lipid-rich components of myelin. The myelin wraps around axons, so in sections stained this way you see blue rings or sheaths surrounding the axon cores. The axons themselves take up the counterstain and appear in a different color, while nuclei and connective tissue stain according to their respective components in the chosen stain. So the blue structures indicate the myelin sheaths.

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