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Acute stimulus-sensitive postanoxic myoclonus: the importance of sensory stimulation in comatose patients

José L Fernández-Torre1, Miguel A Hernández-Hernández

  • 1Department of Clinical Neurophysiology, Marqués de Valdecilla University Hospital, Santander, Cantabria, Spain. jlfernandez@humv.es

Clinical EEG and Neuroscience
|July 14, 2012
PubMed

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Muscle Stimulation Frequency

The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
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When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...