Abstract
1. Isolated pedal ganglia of the pteropodial mollusc, Clione limacina , generate a locomotory rhythm. In 30% of the pedal ganglia preparations the locomotory rhythm was not regular, i.e. the locomotor generator worked in “bursts” alternating with periods of low activity. 2. The “locomotor bursts” were caused by spontaneous activation of command neurons located in the pedal ganglia. 3. A single neuron was extracted from burst-generating preparations by means of the intracellular microelectrode and then its soma was put back, into the initial place between the ganglion cells. Twenty-five percent of the isolated neurons renewed the bursts-related changes in their activity after the insertion into the ganglion. The neurons which were originally excited during the “locomotor bursts” continued to be excited after isolation, while those which were inhibited continued to be inhibited during the bursts. 4. It is suggested that the command neurons controlling the locomotor generator can exert action on the target cells in the absence of morphological synapses.
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