Semithin transverse sections of renal nerves from acute control (A), chronic control (B), acute diabetic (C), chronic diabetic (D), acute diabetic treated with insulin (E) and chronic diabetic treated with insulin (F) animals. The nerve fascicles are enveloped by a well defined perineurium (arrowheads) even when more than one fascicle is present (C). Most of the endoneural space is occupied by unmyelinated fibers but few myelinated fibers (arrows) are present. No morphological differences were evident between groups at this resolution. V = capillary vessels, S = Schwann cell nucleus. Toluidine blue stained, bars = 10 μm.
Sato et al. BMC Neuroscience 2014 15:5 doi:10.1186/1471-2202-15-5