The cord dorsum and dorsal root potentials were recorded during fictious scratching in L6 segment of the thalamic cats. It is shown that primary afferent depolrization (PAD) can be modulated by the central generator of scratching. In some afferent fibres antidromic spikes appear on the top of PAD-waves. Antidromic spikes can be also evoked in the period of… (More)
Activity of motoneurons from pedal ganglia of marine mollusc Clione limacina was recorded during generation of the locomotor rhythm. Motoneuron groups controlling antagonistic wing muscles are active alternatively, excitation of one group being accompanied by inhibition of the other group. Many synergetic motoneurons are electrically coupled.
Effect of serotonin on generation of the feeding rhythm in buccal ganglia was studied in 8 species from 3 subclasses of gastropod molluscs. Serotonin (10(-5) mol/l) initiated or increased the rhythmical activity in the buccal ganglia. The effect of serotonin was potentiated with theophylline (phosphodiesterase inhibitor).
Nervous centers that coordinate rhythmical movements with body stabilization in space are well known in vertebrates. Here we report a single identified interneuron CPB3c (cerebropedal neuron c from group B3) that serves the same function ofpostural control during locomotion in a simple animal model--the marine pteropod mollusk Clione limacina. CPB3c… (More)
FITC-labelled alpha-bungarotoxin (alpha BT[FITC]) was used to identify acetylcholine (ACh)-sensitive neurons in the central nervous system of pteropod mollusc Clione limacina. Two small symmetrical neurons were stained with alpha BT[FITC] on the dorsal surface of the cerebral ganglia. The staining was highly specific as it was completely blocked by… (More)
Functional characteristics of the cerebral serotoninergic neuron (C1) have been studied in the pteropod mollusc Clione limacina. The C1 neuron axon projected to the buccal ganglia and axon collaterals terminated in buccal nerves. Stimulation of the C1 neuron activated the feeding rhythm generator in the buccal ganglia. Effects developed relatively slowly… (More)
Tilts of the freshwater snail Planorbarius corneus, resulting in statocyst receptor stimulation, induced the defensive reaction including pulling down of the shell, shortening of the foot, inhibition of locomotion and feeding. The preparation of the central nervous system has demonstrated that many inter- and motoneurons from different ganglia were involved… (More)
The marine pteropod mollusc Clone limacina swims due to rhythmic movements of its wings. The frequency of wing oscillations in young molluscs (2-6 mm long) is 5-6 Hz, while in adult molluscs (40-60 mm long) it is 1-2 Hz. The locomotor rhythm is generated by two groups of pedal interneurons (groups 7 and 8) capable of endogenous rhythmic activity. The… (More)
The whole body withdrawal reaction of freshwater snail Planorbarius corneus consists of two phases. In the first phase the shell is rapidly moved down to cover the head, in the second one the body is slowly retracted into the shell. The columellar muscle is involved in this behaviour. Motoneurons of the columellar muscle are identified in the cerebral,… (More)
Two antagonistic groups of neurons, active in protractor and retractor phases of the feeding cycle, were found in the buccal ganglia of the pteropod mollusc Clione limacina. Neurons within each group are electrically coupled, while the groups inhibit one another. Each group is able to perform independent rhythmic activity. When the activity of one of the… (More)