Which staining method is used to demonstrate elastic fibers in connective tissue?

• A. Verhoeff's Van Gieson
• B. Van Kossa
• C. Ziehl Neelsen
• D. Mucicarmine

Answer: (A)

Elastic fibers are best visualized when a stain specifically binds elastin and creates a strong contrast with surrounding tissue. Verhoeff's stain, followed by Van Gieson counterstain, does exactly that: the iron-hematoxylin component binds to elastic fibers and makes them black, while the Van Gieson component colors collagen red and other tissue yellow. This distinct black network of elastic fibers against the pink-red collagen and yellow background allows you to clearly assess the integrity and organization of elastic fibers in connective tissue. The other stains target different features: Van Kossa highlights calcium salts, Ziehl-Neelsen detects acid-fast bacteria, and mucicarmine stains mucins, none of which reveal elastic fibers.