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Related Experiment Videos

On counting cranial nerves.

R O'Rahilly1

  • 1Carnegie Laboratories of Embryology, California Primate Research Center, Davis.

Acta Anatomica
|January 1, 1988
PubMed
Summary
This summary is machine-generated.

Cranial nerve enumeration evolved from seven to twelve, with von Sömmerring's system becoming a 200-year convention. Naming standards for these crucial nerves were established nearly a century ago.

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Area of Science:

  • Neuroscience
  • Anatomy

Background:

  • Historical overview of cranial nerve counting systems.
  • Evolution from Galen's seven to Willis' ten and von Sömmerring's twelve cranial nerves.

Observation:

  • The von Sömmerring system has been the standard for approximately 200 years.
  • This system represents one of several possible conventions for enumerating cranial nerves.

Findings:

  • The current enumeration of twelve cranial nerves is largely based on von Sömmerring's system.
  • Standardization of cranial nerve nomenclature occurred nearly a century ago.

Implications:

  • Understanding the historical context of cranial nerve enumeration aids anatomical study.
  • The established convention, while arbitrary, provides a consistent framework for neuroscience and clinical practice.