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Journal of Experimental Biology 57,713-726 (1972)
Published by Company of Biologists 1972

The Burst Activity of Different Cell Regions and Intercellular Co-ordination in the Cardiac Ganglion of the Crab, Eriocheir Japonicus

KENRO TAZAKI ¹

¹ Biological Laboratory, Nara University of Education Takabatake, Nara 630, Japan

1. Various patterns of burst activity in the cardiac ganglion cells of the crab Eriocheir japonicus were observed by means of intracellular electrodes.

2. The pacemaker for burst initiation is located among small cells, and it induces small synaptic potentials in the large cells, increasing their excitability. The anterior large cells generate slow potentials by synaptic activation.

3. The slow potential is the spike generator. The anterior large cells are capable of initiating slow potentials in their own somata without synaptic activation from the small cell.

4. Non-synaptic maintained depolarization takes place in the anterior large cell membrane. The after-depolarization are cumulative and can develop the slow potential, leading to repetitive firing.

5. The posterior large cell is innervated by two pre-synaptic nerve fibres, one being the small pacemaker cell and the other the anterior large cell, showing that it is a follower.

6. Electrical interaction is present among ganglion cells. Positive feedback through electrical connexions is observed between large and small cells.

7. The cardiac ganglion of the crab has some features common and similar to those found in the ganglia of both the lobster and Squilla.

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