Range of variations in motor unit potentials during reinnervation after traumatic nerve lesions in humans

Annals of Neurology
S Borenstein, J E Desmedt


Successive stages in the reinnervation of denervated muscle fibers following a complete or partial motor nerve lesion in humans were analyzed with the concentric needle electrode during voluntary contraction. Motor unit potential (MUP) patterns were displayed by coherent EMG, in which the potential triggers an oscilloscope sweep and a digital delay line enables the early part of the MUP to be displayed. After a complete nerve lesion, MUPs showing the response of as few as one to three muscle fibers can be observed. MUPs become highly polyphasic as more muscle fibers are incorporated. Marked latency jitter and intermittent blocking of components as well as the occurrence of linked potentials result in complex patterns that may be confused with a "myopathic" pattern of brief small spikes if conventional observation of free-running sweeps is used alone. After a partial nerve lesion, the healthy motor axons achieve extensive collateral reinnervation of the denervated muscle fibers whereby linked potentials of various latencies are added after the original MUP. Adequate understanding of these characteristic features can help clarify some current issues in electromyography. The mechanisms by which long-latency linked potentials and d...Continue Reading


Apr 1, 1979·Journal of the Neurological Sciences·G Roth
Sep 1, 1976·Archives of Neurology·J E Desmedt, S Borenstein
Oct 1, 1968·Physiological Reviews·L Guth
Oct 1, 1952·The Journal of Comparative Neurology·A VAN HARREVELD
Sep 1, 1953·The Quarterly Review of Biology·M V EDDS
May 1, 1964·Acta Physiologica Scandinavica·S HALVORSEN
Feb 1, 1965·Journal of Neurology, Neurosurgery, and Psychiatry·P M FULLERTON, R W GILLIATT
May 1, 1949·Journal of Neurology, Neurosurgery, and Psychiatry·I PETERSEN, E KUGELBERG
Feb 1, 1946·The American Journal of Physiology·P WEISS, M V EDDS
Aug 1, 1947·Journal of Neurology, Neurosurgery, and Psychiatry·E Kugelberg

❮ Previous
Next ❯


Sep 9, 1999·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Z C Lateva, K C McGill
Feb 19, 2016·Journal of Magnetic Resonance Imaging : JMRI·Alain R ViddeleerMatthijs Oudkerk
Sep 12, 2015·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Christian KrarupSimon Archibald
Apr 18, 2015·Acta Neurologica Scandinavica·W N LöscherJ Finsterer
Oct 1, 1986·Journal of Child Neurology·C K Jablecki
Feb 3, 2004·Muscle & Nerve·James M Gilchrist, George M Sachs
Oct 1, 1987·Muscle & Nerve·R G Miller
May 1, 1997·Muscle & Nerve·J Finsterer, B Mamoli

❮ Previous
Next ❯

Related Concepts

Related Feeds

Cardiac Conduction System

The cardiac conduction system is a specialized tract of myocardial cells responsible for maintaining normal cardiac rhythm. Discover the latest research on the cardiac conduction system here.