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[2] [11] It is important to understand the effect of these various factors on the normal values for nerve conduction measurements to aid in identifying abnormal nerve conduction study results. The ability to predict normal values in the context of an individual's anthropometric characteristics increases the sensitivities and specificities of ...
Conduction velocity Associated sensory receptors; Ia: Aα: 13–20 μm: Yes: 80–120 m/s [5] Muscle spindle fibres Ib Aα: 13–20 μm: Yes: 80–120 m/s: Golgi tendon organ: II: Aβ: 6–12 μm: Yes: 33–75 m/s: All cutaneous mechanoreceptors including pacinian corpuscles: III Aδ: 1–5 μm: Thin: 3–30 m/s: Free nerve endings of touch and ...
Since these agents do not affect the sodium channel, conduction velocity is not decreased. The prolongation of the action potential duration and refractory period, combined with the maintenance of normal conduction velocity, prevent re-entrant arrhythmias. (The re-entrant rhythm is less likely to interact with tissue that has become refractory).
These fibers are virtually unmyelinated and their conduction velocity is, as a result, much slower which is why they presumably conduct a slower sensation of pain. [7] C fibers are considered polymodal because they can react to various stimuli. They react to stimuli that are thermal, or mechanical, or chemical in nature. [1]
The conduction velocity is measured in meters per second. It is obtained by dividing the distance between the stimulation site and the recording site by the latency: Conduction velocity = Distance/Latency. Sensory NCS: An example screenshot showing the results of a sensory nerve conduction velocity study of the right median nerve.
The size and the spacing of the internodes vary with the fiber diameter in a curvilinear relationship that is optimized for maximal conduction velocity. [5] The size of the nodes span from 1–2 μm whereas the internodes can be up to (and occasionally even greater than)1.5 millimetres long, depending on the axon diameter and fiber type.
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The observation of F-waves in the same motor units (MU) as those present in the direct motor response (M), [10] along with the presence of F-waves in deafferented animal and human models, [11] indicates that F-waves require direct activation of motor axons to be elicited, [12] and do not involve conduction along afferent sensory nerves. Thus ...
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