The activity of neurons from the trigeminal ganglion of pigeons have been recorded while cooling or warming the beak. Thermosensitive neurons were seldom compared with mechanosensitive units. From a total of 16 thermosensitive neurons, 13 were excited by cooling and 3 by warming. The impulse frequency strongly depended on temperature. At constant temperatures, constant firing rates were established. The static curves of cold-sensitive units showed, that with decreasing temperature a nearly linear rise in firing rate occurred between about 36 °C and 20 °C. One quantified, warm-sensitive neuron showed, with increasing temperature, a nearly linear rise between about 35 °C and 44 °C. Sudden cooling or warming caused no pronounced overshoot as in mammals. Six cold-sensitive neurons were totally inhibited by rewarming as were 2 warm-sensitive units by cooling. No comparable influence of temperature on the discharge rate of some slowly-adapting mechanoreceptors (pressure stimulus) was exhibited.
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Supported by the Deutsche Forschungsgemeinschaft (SFB Bionach).
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Necker, R. Response of trigeminal ganglion neurons to thermal stimulation of the beak in pigeons. J. Comp. Physiol. 78, 307–314 (1972). https://doi.org/10.1007/BF00697660
- Discharge Rate
- Constant Temperature
- Firing Rate
- Trigeminal Ganglion
- Ganglion Neuron