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Hypoglossal nerve conduction in normal subjects.

M D Redmond¹, M Di Benedetto

¹Physical Medicine and Rehabilitation Service, Walter Reed Army Medical Center, Washington, DC 20307-5001.

|May 1, 1988

Summary

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A new nerve conduction technique for the hypoglossal nerve (cranial nerve XII) was developed. This reliable method accurately measures motor function, enhancing electrophysiological assessments.

Area of Science:

Neurology
Neurophysiology

Background:

Cranial nerve XII, the hypoglossal nerve, controls tongue movement.
Electrophysiological assessment of cranial nerve motor function is crucial for diagnosing neurological disorders.

Purpose of the Study:

To demonstrate a reliable nerve conduction method for evaluating the hypoglossal nerve (cranial nerve XII).
To establish normative electrophysiological parameters for hypoglossal nerve function.

Main Methods:

Submandibular surface electrical stimulation was applied.
Electromyography recordings were made from the anterior tongue surface.
The study included 30 healthy adult subjects, assessing 60 hypoglossal nerves.

Main Results:

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Mean latency of evoked responses was 2.2 ± 0.4 msec.

Mean amplitude of evoked responses was 3.8 ± 1.6 mV (baseline to peak, best of 5 responses).

The developed method demonstrated reliability in capturing evoked responses.

Conclusions:

A novel and reliable nerve conduction technique for the hypoglossal nerve (cranial nerve XII) has been established.
This method provides normative data for latency and amplitude.
The technique is expected to improve the electrophysiological assessment of hypoglossal nerve motor function.