Physiological and morphological characteristics of Br type neuron in the central nervous system of the snail Helix Pomatia L.

J. Salanki, I. Vadasz, K. Elekes

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Abstract

The bimodal type of activity and the characteristic physiological parameters of the Br type neuron (cell RPal) situated in the right parietal ganglion of Helix pomatia L. were unchanged for hours at constant room temperatur The resting potential just before the burst was 55 ± 5 mV, and increased after the burst to 64 ± 3 mV. The action potential characterized by an overshoot of 20 mV reached an amplitude of about 75 mV. Within the burst consisting of 10 to 20 spikes the interspike intervals first decreased, then they increased. The interval is minimal in the middle of the burst. In contrast, the duration of the spikes increased successively up to the last 2 to 3 spikes, thereafter it decreased. The variation of the interspike interval might have resulted from changes in the membrane potential, while the variation of the spike duration was probably connected with fatigue. The interburst interval was always longer than the duration of the burst; the ratio was 0.7. The axon and processes of the Br neuron were visualized and examined after filling up the soma with an intracellular injection of the fluorescent dye Procion Yellow. The neuron proved to be a unipolar giant cell. Its axon branches remained within the right parietal ganglion and they terminated partly in the neuropil, and partly in the vicinity of the somate of cortical neurons.

Original languageEnglish
Pages (from-to)243-254
Number of pages12
JournalActa physiologica Academiae Scientiarum Hungaricae
Volume42
Issue number3
Publication statusPublished - Dec 1 1972

ASJC Scopus subject areas

  • Physiology

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