Which stain demonstrates astrocytic processes?

• A. Holzer
• B. Bodian
• C. Bielschowsky
• D. Cresyl echt Violet

Answer: (A)

Holzer stain is used to reveal glial fibers, especially the processes of astrocytes. Astrocytes have extensive, branching processes that extend through the neuropil and envelop vessels and synapses. The Holzer method selectively impregnates these glial fibers, making the astrocytic network appear as a dark, filamentous pattern. This visualization helps identify astrocytes and assess gliosis.

By comparison, stains like Bielschowsky or Bodian highlight neuronal processes and neurofibrils, while Cresyl echt Violet stains Nissl substance in neuronal cell bodies. Those methods don’t emphasize astrocytic processes, which is why Holzer is the best choice for demonstrating them.