Table 2. Morphometric findings of sural nerves from control, untreated and insulin-treated STZ-induced diabetic rats.

	Control	Untreated STZ-induced diabetic rats	Insulin-treated STZ-induced diabetic rats
N	12	10	10
Fascicular area (mm2)	0.071±0.004	0.070±0.003	0.076±0.002
MFD (103/mm2)	15.0±0.5	15.3±0.6	14.6±0.6
Myelinated fiber area (µm2)	39.2±0.9	39.1±1.2	38.5±1.5
Axonal area (µm2)	19.0±0.4	18.9±0.6	18.8±0.9
Axon/myelin ratio	1.01±0.02	0.98±0.02	1.00±0.03

Data are means ± SE. Intact myelinated fibers were morphometrically analysed. MFD: myelinated fiber density.