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Related Concept Videos

Cranial Nerves: Types Part I01:14

Cranial Nerves: Types Part I

Cranial nerves are responsible for transmitting motor and sensory information between the brain and various parts of the body. There are twelve pairs of cranial nerves, with the first six being essential in sensory perception, motor control, and autonomic functions related to the head and neck.
Olfactory Nerve (Cranial Nerve I)
The olfactory nerve, or cranial nerve I, is unique as it is purely sensory and dedicated to the sense of smell. This nerve originates in the olfactory epithelium of the...

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Quantitative method to evaluate the functionality of the trigeminal nerve.

René Caissie1, Pierre-Eric Landry, Robert Paquin

  • 1Laboratoire d'Organogénèse Expérimentale (LOEX), Department of Surgery, Laval University, Québec, Canada.

Journal of Oral and Maxillofacial Surgery : Official Journal of the American Association of Oral and Maxillofacial Surgeons
|October 24, 2007
PubMed
Summary
This summary is machine-generated.

This study establishes normal current perception threshold (CPT) values for the trigeminal nerve, aiding in the assessment of nerve function. Gender and training influenced CPT results, particularly at 2,000 Hz.

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Area of Science:

  • Neurology
  • Sensory Physiology

Background:

  • The trigeminal nerve's third division plays a crucial role in facial sensation.
  • Assessing its functionality is vital for diagnosing neurological conditions.
  • Current perception threshold (CPT) testing offers a quantitative method for evaluating nerve function.

Purpose of the Study:

  • To establish normative CPT values for the third division of the trigeminal nerve in a healthy population.
  • To assess the impact of gender on CPT values.
  • To evaluate the effect of repeated testing (training) on CPT measurements.

Main Methods:

  • Fifty healthy participants underwent CPT testing using a Neurometer device.
  • Stimuli were applied at 5 Hz (C fibers), 250 Hz (Adelta fibers), and 2,000 Hz (Abeta fibers) to the mental foramen area.
  • Bilateral testing was performed, with a second measurement session to assess training effects.

Main Results:

  • Mean CPT values were established for each frequency: 157.6 ± 54.67 µA (2,000 Hz), 53.10 ± 27.64 µA (250 Hz), and 33.44 ± 23.17 µA (5 Hz).
  • Gender differences were observed only at 2,000 Hz (P < .02).
  • A significant decrease in CPT values at 2,000 Hz was noted in men after the second measurement (P < .01), indicating a training effect.

Conclusions:

  • The Neurometer provides a valuable tool for evaluating sensory dysfunctions of the trigeminal nerve.
  • CPT testing can aid in the intraneural localization of sensory deficits.
  • This method supports initial diagnosis and ongoing monitoring of neurological status.