The second morning (Tuesday, Aug. 29, 1931) of the International Neurological Congress was devoted to the tonus of skeletal muscle, the papers being presented by authorities on the subject who were especially invited by the program committee to contribute to the symposium. The chairman (an obvious and perfect choice) was Sir Charles Sherrington, whose remarks helped to bring some order out of the chaos of ideas presented.
The first paper was by Ranson (professor of neurology at Northwestern University Medical School), the title being "Nuclei and Fiber Tracts Concerned in the Postural Reaction Elicited by Stimulation of the Mesencephalic Tegmentum." His abstract states that stimulation of the mesencephalic tegmentum produces a definite postural reaction-bending of the spine with concavity to the side stimulated, turning of the head to that side, flexion of the ipsolateral forelimb and extension of the contralateral forelimb. This reaction was elicited by stimulation of the
COBB S, WOLFF HG. MUSCLE TONUS: A CRITICAL REVIEW BASED ON WORK PRESENTED AT THE INTERNATIONAL NEUROLOGICAL CONGRESS, BERN, SWITZERLAND, 1931. Arch NeurPsych. 1932;28(3):661–678. doi:10.1001/archneurpsyc.1932.02240030181010
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