Luxol Fast Blue-Holmes' Silver Nitrate Method is used to demonstrate which tissue components?

• A. Myelin and nerve fibers
• B. Nuclei
• C. Lipids
• D. Blood vessels

Answer: (A)

This staining combination is used to visualize myelin and nerve fibers. Luxol Fast Blue binds to the lipid-rich myelin in white matter, turning it blue. The Holmes’ silver nitrate step then deposits silver on the axons and neurofibrils, producing a darkened, high-contrast stain of nerve fibers against the blue myelin background. This makes it possible to assess the integrity of myelin and the fiber tracts, which is particularly important in neuropathology when evaluating demyelinating conditions. The other options don’t fit because nuclei are best seen with nuclear stains, lipids with lipid-specific stains, and blood vessels with vascular or basement membrane stains; those targets aren’t the primary focus of this combined method.