Interstitial voltage and potassium concentration in the mesothoracic gaglion of a stick insect at rest and during neuronal activation
1996
Dorr, H. | Hess, D. | Gramoll, S.
In the mesothoracic ganglion of the stick insect Cuniculina impigra the interstitial voltage and potassium concentration were measured. The interstitial voltage was measured using conventional glass microelectrodes and had a mean value of +17.6 mV (+/- 4.7 mV, N = 14 animals). The potassium concentration in the interstitium was measured using ion-selective microelectrodes and had a mean value of 4.3 mM (+/- 1.1 mM, N = 13 animals). The interstitial voltage and the interstitial potassium concentration changed when the ganglion was superfused with solutions containing different potassium concentrations: in bath solutions containing, e.g. high potassium concentrations, the interstitial voltage increased and the interstitial potassium concentration increased. The interstitial voltage decreased by 1-5 mV when neuronal activity was evoked by stimulating a nerve electrically. When an animal was activated by stimulation with a paintbrush, the interstitial voltage decreased by 2.7 mV (+/- 1.1 mV, N= 3 animals) and the interstitial potassium concentration increased by 0.4 mM (+/- 0.2 mM, N= 3 animals).
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