Table 1.

Summary of the single-fiber recordings

Stimulation	Mechanical (von Frey)	Heat (48°C)	Cold (4°C)	BK (10 μm)
Fibers responsive in the receptive field	51	38	8	85%a
Fibers responsive also in the axon	7	25	2	2 of 13
Proportion of fibers sensitive in both RF and axon	11%	65.7%	25%	15%

Fibers responsive in their endings and axons to mechanical and thermal stimuli are shown. The numbers listed in the BK column represent the share of BK-sensitized axons out of 13 tested fibers.

^aAlthough only the axons were examined in the present study, 85% of the nerve endings are principally known to express B₂ receptors and respond to BK with discharge activity and a huge prevalence of heat sensitization (Liang et al., 2001).