Axonal Excitability Testing
Axonal Excitability Testing - Related Videos
04:56
In Vivo Electrophysiological Measurement of the Rat Ulnar Nerve with Axonal Excitability Testing
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Cited by 3 •
2018
Axonal excitability techniques provide a powerful tool to examine pathophysiology and biophysical changes that precede irreversible degenerative events. This manuscript demonstrates the use of these techniques on the ulnar nerve of anesthetized rats.
07:42
Nerve Excitability Assessment in Chemotherapy-induced Neurotoxicity
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Cited by 28 •
2012
This abstract describes a novel method to assess the development of neurotoxicity in patients receiving chemotherapy treatment. While conventional assessment methods are limited in their ability to detect early changes in nerve function, nerve excitability techniques provide early identification of patients at risk of severe neurotoxicity and insight into pathophysiology.
02:29
External Excitation of One-Dimensional Patterned Neuronal Cultures
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2025
This video demonstrates a technique for stimulating line-patterned neuronal cultures with a uniform, unidirectional electric field.
03:24
Two-Photon Laser Axotomy: A Method to Injure Axons in Zebrafish Embryos and Observe Axonal Recovery
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2023
This video describes the method to injure axons in zebrafish embryos using two photon laser axotomy and observing axonal recovery from injury.
12:13
Assessing Primary Motor Cortex Excitability and Excitability Modulation by Pairing Transcranial Magnetic Stimulation with Electromyography
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2025
Here, we present a protocol outlining the methodology to assess primary motor cortex excitability and excitability modulation using transcranial magnetic stimulation (TMS) paired with electromyography (EMG).
FAQs
Threshold indicates how much electrical stimulation is needed to activate the nerve, whereas recovery-cycle measurements show how excitability changes after an action potential. Refractoriness describes a period of reduced responsiveness, while later recovery reflects the return of firing capacity. Together, these measures provide complementary information about membrane behavior rather than relying only on the recorded response size.
Voltage-gated ion channels help determine whether an axon reaches the electrical conditions required to fire and conduct an action potential. Their activity influences threshold, refractoriness, accommodation, and recovery responses. Consequently, an excitability profile can reveal altered ion-channel function or changes in membrane behavior, giving the measurements physiological meaning beyond a simple assessment of nerve signal presence.
Membrane polarization changes how readily an axon responds to a subsequent electrical stimulus. By varying stimulus intensity and timing, Axonal Excitability Testing examines how polarization-related changes affect threshold, accommodation, and recovery. These responses help distinguish altered membrane behavior from a general reduction in nerve function and connect the recorded compound action potential to the underlying firing properties of axons.
The procedure applies controlled electrical stimuli to a nerve and records the resulting compound action potential. Investigators then vary stimulus intensity to assess threshold-related responses and alter stimulus timing to examine refractoriness, accommodation, and recovery cycles. The resulting pattern is interpreted as a profile of peripheral nerve excitability and membrane behavior under the tested conditions.
The compound action potential is the recorded outcome used to evaluate how a population of axons responds to stimulation. Examining this response while stimulus intensity and timing change allows investigators to relate nerve activation to threshold, conduction, and recovery properties. This provides a broader physiological picture than measuring a single response under one stimulation condition.
This method is useful when researchers need to characterize peripheral nerve physiology or investigate altered axonal behavior. It can help identify changes associated with neurological disease, nerve injury, or treatment, while also supporting evaluation of ion-channel function. Comparing excitability measures across conditions can show whether membrane responses or firing readiness have changed in the studied nerve.