Ring fibers & Sarcomere disorientation

NADH stain

H&E stain

Congo red stain

Ring fibers NADH stain : Note ring of striations, perpendicular to normal orientation, around circumference of muscle fiber H & E stain: Internal, ring-shaped, dark-staining regions in small fibers Congo red: "Amorphous" ring in a muscle fiber with paler central region

NADH stain

Dark staining sarcoplasmic pad around rim of fiber (Right)