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The premotor potential.

D Dumitru1, N E Walsh, S Ramamurthy

  • 1Department of PM&R, University of Texas Health Science Center, San Antonio 78284-7798.

Archives of Physical Medicine and Rehabilitation
|July 1, 1989
PubMed
Summary
This summary is machine-generated.

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The palmar cutaneous branch of the median nerve does not cause the thenar premotor potential. Blocking the main median nerve at the thenar eminence eliminated this potential, confirming its origin.

Area of Science:

  • Neuroscience
  • Clinical Electrophysiology

Background:

  • A small waveform, the premotor potential, precedes the thenar compound muscle action potential during median nerve stimulation.
  • Recent suggestions proposed the palmar cutaneous branch of the median nerve as the source of this premotor potential.

Purpose of the Study:

  • To investigate the origin of the premotor potential recorded from the thenar eminence.
  • To determine if the palmar cutaneous branch of the median nerve is the source of the thenar premotor potential.

Main Methods:

  • The palmar cutaneous branch of the median nerve was blocked at the wrist.
  • The main median nerve was blocked at the base of the thenar eminence.
  • Electrophysiological recordings of premotor and midpalmar potentials were analyzed.

Related Experiment Videos

Main Results:

  • Blocking the palmar cutaneous branch at the wrist did not affect the premotor response or midpalmar potential.
  • Blocking the main median nerve at the thenar eminence abolished the premotor potential.
  • Anesthesia from the palmar cutaneous nerve block was localized to the proximal midpalm, not the thenar eminence.

Conclusions:

  • The palmar cutaneous branch of the median nerve does not generate the thenar premotor potential.
  • The premotor potential originates from the main trunk of the median nerve supplying the thenar muscles.
  • Volume conduction effects complicate electrophysiological localization of the palmar cutaneous branch due to nerve proximity.