The issue in the image would not result from which of the following?

• A. An extended block holder shaft
• B. An improperly clamped block
• C. An improperly dried slide
• D. A dull blade

Answer: (A)

Microtomy artifacts come from issues with the blade, how the block is held, or how the slide is prepared. A dull blade tends to pull or tear tissue, giving rough edges or thick, uneven sections. If the block isn’t clamped properly, the block can shift during cutting, producing chatter or an uneven surface. An improperly dried slide can cause tissue to lift or wrinkle during mounting, leading to folds or poor adhesion that show up after staining. An extended block holder shaft, on the other hand, changes only the physical positioning of the block relative to the knife and does not alter blade sharpness, clamping stability, or slide drying. Therefore it would not produce the artifact shown.