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Related Experiment Videos

Middle-finger reflex.

Uner Tan1

  • 1Department of Physiology, Cukurova University Medical School, Adana, Turkey. unertan@cu.edu.tr

The International Journal of Neuroscience
|April 29, 2006
PubMed
Summary
This summary is machine-generated.

Researchers describe a new middle-finger extensor reflex. This reflex involves two distinct electromyography (EMG) responses, M1 and M2, with potential clinical significance in forearm muscle function.

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Area of Science:

  • Neuroscience
  • Human Physiology
  • Motor Control

Background:

  • Understanding human reflexes is crucial for diagnosing neurological conditions.
  • The extensor digitorum communis muscle plays a key role in hand and finger extension.
  • Existing knowledge of forearm reflexes is extensive, yet new pathways continue to be discovered.

Purpose of the Study:

  • To describe a newly identified reflex: the middle-finger extensor reflex.
  • To characterize the electrophysiological properties and latency of this reflex.
  • To elucidate the neural circuitry involved in the middle-finger extensor reflex.

Main Methods:

  • Percussion of the tendon insertion of the musculus extensor digitorum communis in the forearm.
  • Electromyography (EMG) recordings from the muscle belly to detect reflex responses.

Related Experiment Videos

  • Analysis of reflex latency to differentiate between neural pathways.

    • Main Results:

    • A short-latency monosynaptic reflex (M1) with a mean latency of 31.4 ms was recorded.
    • A long-latency middle-finger reflex (M2) with a mean latency of 64.8 ms was identified.
    • The M1 reflex represents a monosynaptic extensor response, while M2 involves spino-cortico-spinal pathways.

    Conclusions:

    • A novel middle-finger extensor reflex has been successfully described.
    • The reflex involves distinct M1 (monosynaptic) and M2 (spino-cortico-spinal) components.
    • This reflex, mediated by radial nerve pathways (C7-C8), holds potential clinical and theoretical importance.