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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).
Gap junctions (GJs) are composed of membrane proteins that form channels connecting the cytoplasm of adjacent cells and permeable to ions and small molecules. They are considered to be the main or only type of intercellular channels and a universal feature of all multicellular animals (Metazoa). Till recently, sea anemones and corals (Anthozoa, Cnidaria)… (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 response of vestibulospinal neurons to the tilt in the frontal plane was studied in decerebrate cats. The neurons were identified antidromically by L1 stimulation. The response to the tilt was found to be correlated with the speed of axonal conductance: the neurons responding to the ipsilateral tilt had the latency of the antidromic response 2.8 +/- 0.7… (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)
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)
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)
Neurons whose excitation affected the locomotory rhythm were recorded in the isolated pedal ganglia of the marine mollusc Clione limacina. Some of these neurons generated "plateau" potentials, i.e. they remained depolarized for a long period after termination of the initial depolarizing current. A role of the command neurons in the motor behaviour of Clione… (More)