Nervous outflow from the cat's foot during noxious radiant heat stimulation

摘要: (1) Radiant heat pulses (10 sec in duration) at noxious levels were applied to the hind foot of cat order establish quantitatively response characteristics single afferent units, and evaluate total outflow. (2) In plantar nerves, 16% C-fibers activated by (50 °C). The thresholds majority these ‘C-heat receptors’ between 40–45 °C. discharges related linearly level skin temperature, high correlation coefficient suggesting receptors be able signal intensity stimuli. (3) The showed a steady discharge long-lasting stimuli (e.g. 5 min). About half them could excited addition mechanical stimuli, mostly range (⩽ 300g/0.8sq.mm). Sensitization was observed some repeated exposition heat. (4) Among myelinated fibers about threshold mechanoreceptors with group III afferents exhibited heating above 45°C, there being however low temperature frequency. In pad II (RA SA) suppression adequate stimulation occurred during skin.