[Reactions of tonically active motor neurons to the stimulation of different afferents].
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Biomedical subjects
Publications and source records attributed to V I Alatyrev.
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Models of excitatory tonic protective reflex revealed different reflex responses of skeletal muscles to stimulation of somatic or visceral afferents. The correlation of inhibitory and excitatory responses was found for dogs and rats. The observed phenomena are considered as the development of V. N. Tchernigovsky's idea of interoceptors influences upon skeletal muscles.
The change of reflex motoneuron excitability of sacral spinal cord segments was investigated by method of monosynaptic testing in acute experiments on spinal dogs. The H- and M-responses of square plantar muscle were recorded. The presence of H1- and H2-components of monosynaptic nature was revealed in this muscle. Chemical irritation of abdominal viscera led mostly to a decrease of H-response threshold, an increase of its maximal amplitude and growth of post-tetanic potentiation effect. The latter change was more obvious for H2-component. The data obtained suggest an increase of reflex excitability of both "fast" and "slow" spinal motoneurons on intensive irritation of peritoneum.
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