Table 2.

Electrical properties of DRG neurons

Bladder (n = 59 cells) Proximal urethra (n = 48 cells) Distal urethra (n = 45 cells)
TTX-resistant neurons 42 cells (71%) (25.3 ± 1.6 μm) 35 cells (73%) (27.2 ± 1.4 μm) 24 cells (53%a) (26.2 ± 1.3 μm)
Spike duration 7.9 ± 0.7 msec 8.1 ± 1.1 msec 7.6 ± 0.9 msec
Spike threshold −20.4 ± 1.1 mV −22.4 ± 2.1 mV −21.6 ± 1.6 mV
Capsaicin sensitivity 28/30 cells (93%) 20/22 cells (91%) 16/17 cells (94%)
TTX-sensitive neurons 17 cells (29%) (33.1 ± 2.1 μm) 13 cells (27%) (32.2 ± 1.9 μm) 21 cells (47%a) (37.8 ± 1.9 μm)b
Spike duration 5.4 ± 0.5 msec 4.9 ± 0.8 msec 4.4 ± 0.6 msec
Spike threshold −29.1 ± 1.6 mV −31.2 ± 1.9 mV −30.5 ± 2.1 mV
Capsaicin sensitivity 1/14 cells (7%) 1/10 cells (10%) 1/15 cells (7%)
  • Data were obtained from eight (bladder), seven (proximal urethra), and eight (distal urethra) rats.

  • a p < 0.05 compared with the percentage of bladder or proximal urethral neurons (χ2 test).

  • b p < 0.05 compared with the diameter of bladder or proximal urethral neurons (t test).