Table 3.

Means and standard errors of the values of the cell bodies areas and density of the nNOS-IR myenteric neurons of the duodenum of rats exposed or not to F chronically, through the drinking water for 30 days.

GROUPS	Cell bodies areas of the nNOS-IR neurons (µm2)	Density nNOS-IR neurons (neurons/cm2)
Control	281.8 ± 2.90a	5,339.6 ± 125.2a
10 ppm F	274.9 ± 2.97ab	5,257.1 ± 135.0a
50 pm F	267.5 ± 2.99b	4,706.3 ± 124.4b

Animal groups: Control (deionized water–0 ppm F), 10 ppm F, and 50 ppm de F. In the quantitative analysis the Fisher’s test was applied but no significant difference was observed among the groups. In the morphometric analysis, means followed by different letters in the same column are statistically different according to Tukey’s test (p < 0.05).