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Journal of Experimental Biology 131,205-213 (1987)
Published by Company of Biologists 1987

Intracellular Recording from Receptor Cells of the Temporal Organ of the Japanese House Centipede, Thereuonema Hilgendorfi: Receptor Potential and Conductance Changes

KENJIRO YAMANA 1 and YOSHIHIRO TOH 1

1 Department of Biology, Faculty of Science, Kyushu University, Fukuoka 812, Japan

To whom offprint requests should be addressed

The primary process of carbon dioxide reception in the temporal organ of the Japanese house centipede Thereuonema hilgendorfi has been studied by means of intracellular recording.

1. During adaptation to air containing no carbon dioxide, the membrane potential of receptor cells in the temporal organ ranged from -25 to -59 mV with an average of -39mV (N = 21). Input resistance ranged from 10 to 46M with an average of 22.6M (N = 16).

2. Receptor cells responded to a carbon dioxide stimulus with a graded hyperpolarizing receptor potential, which reduced impulse frequency. The decrease in steady-state frequency was proportional to the amplitude of the receptor potential.

3. During the receptor potential, the input resistance increased. Injection of hyperpolarizing current resulted in an increase in amplitude of receptor potential, while depolarizing current caused a decrease. These results suggest that the receptor potential is caused by a decrease in membrane permeability to ions whose equilibrium potential is more positive than the membrane potential adapted to 0 % carbon dioxide.

Key words: temporal organ, house centipede, carbon dioxide receptor, receptor potential, intracellular response

Accepted on May 27, 1987






© The Company of Biologists Ltd 1987