Contractions of single motor units are reflected in membrane potential changes of homonymous alpha-motoneurons. Journal Article uri icon



  • In anesthetized cats 3 medial gastrocnemius (MG) motor units (MUs) were electrically activated with independent pseudorandom patterns at physiological mean rates. Recordings of isometric MG tension (T) and membrane potential changes (PSPs) in MG alpha-motoneurons (MNs) were averaged with respect to each stimulus train. The resulting T and PSP trajectories displayed the responses of each MN to the 3 average MU twitches. These responses could vary from no response to a sequence of depolarizing and hyperpolarizing waves in a PSP trajectory. The results are consistent with the known behavior of muscle stretch receptors to muscle and MU twitches and the receptors' connections to homonymous MNs.

publication date

  • April 1, 1984

Full Author List

  • Koehler W; Hamm TM; Enoka RM; Stuart DG; Windhorst U

Other Profiles

Additional Document Info

start page

  • 379

end page

  • 384


  • 296


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