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A neurophysiological approach to brainstem reflexes. Blink reflex.

A Esteban1

  • 1Department of Clinical Neurophysiology, Hospital General Universitario Gregorio Marañón, Madrid, Spain.

Neurophysiologie Clinique = Clinical Neurophysiology
|March 27, 1999
PubMed
Summary

The blink reflex (BR) is a vital neurological test for diagnosing disorders. This review details the electrically elicited BR, its complex pathways, and its clinical significance in understanding neurological conditions.

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Area of Science:

  • Neuroscience
  • Clinical Neurophysiology

Background:

  • The blink reflex (BR) is a generalized mammalian reflex with protective eye functions.
  • Historically used in neurological examinations, its electrophysiological study has evolved over decades.
  • This review focuses on the electrically elicited BR, a reliable clinical neurophysiology model.

Purpose of the Study:

  • To review the blink reflex (BR) elicited by electrical stimulation of the trigeminal supraorbital nerve.
  • To elucidate the complex central pathways and anatomical substrates of the BR.
  • To emphasize the BR's role in diagnosing neurological disorders and understanding pathophysiology.

Main Methods:

  • Focus on the electrically elicited blink reflex (BR) via trigeminal supraorbital nerve stimulation.
  • Analysis of the reflex's three components (R1, R2, R3) and their central pathways.
  • Review of habituation and suppression-recovery methods for assessing BR excitability.

Main Results:

  • The BR involves complex brainstem pathways connecting trigeminal afferents to facial efferents.
  • Suprasegmental influences from the cerebral cortex and basal ganglia significantly impact the BR.
  • The BR's relationship with the dopaminergic system and its impairment in neurological diseases is highlighted.

Conclusions:

  • The blink reflex (BR) is a crucial diagnostic tool in clinical neurophysiology.
  • Understanding the BR's neural structures and influences aids in diagnosing numerous neurological disorders.
  • The BR provides essential pathophysiological insights into various human neurological conditions.