The Masterclass by IFCN presentations were created in response to a call from IFCN members societies for more high quality, complimentary, online educational content. The series will provide a new presentation every month from top clinical neurophysiologists around the world, and each will include time for discussion with the lecturer following the presentation.

Providing the best in contemporary clinical neurophysiology education delivered in the most optimal format is the primary educational goal of the IFCN. As such, Masterclass by IFCN will be available complimentary to all registrants.

Masterclass by IFCN: Action Potential Generation and Intermittent Conduction Block in Myelinated Axons

Join us for the next Masterclass by IFCN presentation on Saturday, December 5, 2020 at 6:00 pm EST.

Professor David Burke will present Action Potential Generation and Intermittent Conduction Block in Myelinated Axons.

Intricate mechanisms have evolved such that axons can conduct impulse trains securely, but the fine details differ for sensory and motor axons. It is a theme of this talk that motor axons are more likely to block than sensory for the same insult and that, in critically impaired axons, normally innocuous manoeuvres can precipitate conduction block. We have identified three differences between sensory and motor axons. (i) The resting membrane potential of sensory axons seems to be about 4 mV more depolarised than for motor axons. (ii) There is a greater persistent Na+ current on sensory axons than motor, probably due to the difference in resting membrane potential. (iii) There is greater activity of HCN channels (hyperpolarization-activated cyclic nucleotide-gated channels) on sensory axons than motor, such that activity causes greater hyperpolarization for motor axons than sensory. These differences render sensory axons more excitable than motor, and more prone to ectopic activity. However, they also offer some protection against conduction block. Fluctuation in the ability to conduct can produce a fluctuating deficit if a sufficient number of axons is affected.

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A. Husain, Department of Neurolology, Duke University Medical Center

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M. Hallett, Human Motor Control Section, NINDS, NIH

Clapham’s Sign; Stretch Sensitive Facial Muscle Contraction after Complete Denervation

L. Clapham, D. Allen, R. Arunachalam, and J. Cole
Wessex Neurological Centre, Southampton and Poole Hospital, Universities of Southampton and Bournemouth