Which staining method is commonly used to differentiate collagen, muscle, and elastic fibers in connective tissue?

• A. Hematoxylin and eosin
• B. Movat pentachrome
• C. Gram stain
• D. PAS

Answer: (B)

Specialized multichromatic staining is used to differentiate multiple connective tissue components in one section. Movat pentachrome colors collagen yellow, muscle red, and elastic fibers black, with nuclei dark blue and other matrix elements blue. This distinct color mapping lets you see the arrangement and relationship of these fibers clearly, making it the best choice for distinguishing collagen, muscle, and elastic fibers in connective tissue on a single slide.

General stains like hematoxylin and eosin provide broad tissue morphology but don’t selectively color these three fiber types in separate hues, so the differentiation isn’t as clear. Gram stain is for bacteria, not tissue components. PAS highlights carbohydrates and mucopolysaccharides rather than differentiating these fibers, so it won’t give the same targeted contrast between collagen, muscle, and elastic fibers.