What thickness should tissue be cut on?

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Multiple Choice

What thickness should tissue be cut on?

Tissue must be cut into extremely thin sections so light can pass through and detail can be seen clearly under a microscope. For standard paraffin-embedded tissue used in light microscopy, the target thickness is about 3 to 5 micrometers (μm). To put that in perspective, 1 mm is 1000 μm, so these sections are thousands of times thinner than a millimeter. The tiny thickness is what lets you resolve cellular features after staining; if the sections were thicker, light scatter would blur details and stains wouldn’t yield sharp contrast. For frozen sections, you’d still be in the micrometer range (roughly 5–20 μm), and for electron microscopy you’d cut even thinner (tens of nanometers). So the key idea is: very thin sections, typically around 3–5 μm for light microscopy.

Tissue must be cut into extremely thin sections so light can pass through and detail can be seen clearly under a microscope. For standard paraffin-embedded tissue used in light microscopy, the target thickness is about 3 to 5 micrometers (μm). To put that in perspective, 1 mm is 1000 μm, so these sections are thousands of times thinner than a millimeter. The tiny thickness is what lets you resolve cellular features after staining; if the sections were thicker, light scatter would blur details and stains wouldn’t yield sharp contrast. For frozen sections, you’d still be in the micrometer range (roughly 5–20 μm), and for electron microscopy you’d cut even thinner (tens of nanometers). So the key idea is: very thin sections, typically around 3–5 μm for light microscopy.

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