三色染色法示：骨骼肌纤维萎缩
图中可见萎缩肌纤维，也可见正常肌纤维。虽然细胞数量与萎缩前相同，但肌纤维缩小了。这是一种对损伤的适应性反应，通过萎缩使其存活。本例中间萎缩的肌纤维没有神经的支配(去神经性萎缩)。骨骼肌萎缩最常见的原因是失用。
There are some muscle fibers here that show atrophy. The number of cells is the same as before the atrophy occurred, but the size of some fibers is reduced. This is a response to injury by "downsizing" to conserve the cell. In this case, innervation of the small fibers in the center was lost. This is a trichrome stain.