[Excitability of spinal cord motor neurons and effect of stimulating peritoneal receptors].
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.
D000818:Animals; D004285:Dogs; D004576:Electromyography; D009046:Motor Neurons / Q000502:physiology*; D010537:Peritoneum / Q000294:innervation*; D011930:Reaction Time / Q000502:physiology; D012018:Reflex / Q000502:physiology*; D012023:Reflex, Monosynaptic; D013116:Spinal Cord / Q000502:physiology*
Vozbudimost' motoneĭronov spinnogo mozga i ee izmeneniia pri razdrazhenii retseptorov briushiny.