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Crotaline pit organs analyzed as warm receptors
Cellular and Molecular Neurobiology
|March 1, 1981
Summary
Pit viper facial pits are highly sensitive thermoreceptors, responding more to temperature change rates than direction. Altering heat capacity changes their response patterns, indicating heat flow direction isn't a key stimulus.
Area of Science:
- Neuroscience
- Sensory Physiology
- Herpetology
Background:
- Pit vipers possess specialized facial pits containing thermoreceptors.
- Understanding these thermoreceptors is crucial for comprehending prey detection and environmental sensing in snakes.
Purpose of the Study:
- To investigate the response characteristics of thermoreceptors in the Agkistrodon blomhoffi brevicaudus facial pit.
- To determine the sensitivity of these receptors to temperature change rates and heat flow direction.
Main Methods:
- Single-fiber electrophysiological recordings from the trigeminal nerve of Agkistrodon blomhoffi brevicaudus.
- Application of steady and dynamic thermal stimulation to the facial pit membrane.
- Manipulation of the pit membrane's heat capacity to observe response pattern changes.
Main Results:
- Facial pit thermoreceptors exhibit high sensitivity to the rate of change in receptor temperature.
- Altering the heat capacity of the pit membrane modified the response pattern.
- The spatial gradient theory, predicting response reversal with heat flow reversal, was inapplicable to these pit receptors.
Conclusions:
- The direction of heat flow is not a significant stimulus component for Agkistrodon blomhoffi brevicaudus pit receptors.
- Response patterns are influenced by the rate of temperature change and the heat capacity of the pit membrane.