Fig. 3. Endoplasmic reticulum (ER) features in electron micrograph images of dorsal root ganglion (DRG) neurons. (  A ) Cisternal stacks, quantified by a scale from 0 (none) to 3 (extensive), showed no effect of injury on frequency of cisternal stacks in large neurons, but significant decrease in cisternal stacks in axotomized fifth lumbar (L5) DRG neurons after spinal nerve ligation (Kruskal-Wallis test, multiple comparisons of mean ranks). (  B ) The degree of aggregation of ribosomes in DRG neurons was likewise categorized from 0 (no polysomes) to 2 (predominantly rosettes). Level of aggregation was reduced in both the large and small neurons (Kruskal-Wallis test, multiple comparisons of mean ranks). (  A ) Control.