J.Jpn. Surg. Soc.. 59(1): 105-114, 1958

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EXPERIMENTAL STUDIES ON EXCITABILITY AND CONDUCTION TIME OF CORTICALLY INDUCED MOVEMENTS

I studied excitability and conduction time of cortically induced movements with electromyography. Experiments were performed on adult dogs of about 10 kg. Stimulating voltage is within 50V, duration 1 m-sec. singular rectangular current.
I obtained two responses that have latency of about 10-20 m-sec. (PR) ＆ 20-30 m-sec. (ER) when I stimulated the cortical motor area. These responses were found on flexor and extensor of all the limbs. The threshold of ER is lower than PR. When I cut the pyramidal tract, the PR disappears. But under pentobarbital anaesthesia the ER disappears, and under ether narcosis both responses were recognized.
Therefore, I think that PR has an intimate connection with the pyramidal system and the ER has an intimate connection with the extrapyramidal system. The latency of ipsilateral responses is the same as the contralateral responses, but the threshold is much higher. So I think that ipsilateral movements are concerned with not only the extrapyramidal system but also the pyramidal system.
(author's abstract)

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