Iu A Darinskiĭ

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Experiments in frogs have shown that a prolonged orthodromic rhythmical activation of motoneurons induce changes in their size and staining. Under these conditions the size of all components of motoneurons (cytoplasm, nucleus, nucleolus) is changed. The cytoplasm size changes are more pronounced than those of the nucleus. Under prolongation of the low(More)
The change of the neuron's functional state when the cells become unable to generate spike responses to orthodromic testing stimuli, was shown not to be reflected in the morphological pattern of motoneurons as revealed by means of Einarsson's RNA staining. High-frequency stimulation of the motoneurons generating neither postsynaptic nor spike potentials(More)
Effect of 10 min stimulation on the motoneurones ultrastructure depended on the amplitude of the ventral root biopotentials. In case of low amplitudes dilated endoplasmic spaces, Golgi complex cisterns were seen. Mitochondria were swollen and the number of free ribosomes increased. In the cytoplasm many "whorl--like" structures appeared. In case of high(More)
It is shown in this work that vasopressin at the concentrations of 1 x 10(-16) to 1 x 10(-6) mol/l decreased statistically significant the amplitude of the electrosensitive sodium and calcium ionic currents of the mollusc's Lymnaea stagnalis neuronal membrane. This peptide increased the amplitude of the fast potassium current at the concentration of 1 x(More)
Reactions of the spinal motoneurons to the afferent inflow were different in frogs: some neurons generated spike potentials during 10-min rhythmic stimulation (1/sec) of afferents, other neurons were switched on and off. The motoneurons and their synapses increased in size, their cytoplasmic matrix became lighter and ribosoms deteriorated. Antidromic(More)