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Related Experiment Videos

Encapsulated nerve structures in the human vocal cord. An electronmicroscopic study.

T Nagai1

  • 1Department of Otolaryngology, Miyazaki Medical College, Kiyotake, Japan.

Acta Oto-Laryngologica
|September 1, 1987
PubMed
Summary

Specialized nerve endings in the human vocal cord detect mechanical stimuli. These receptors likely sense vocal cord rigidity and tension during voice production.

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Area of Science:

  • Anatomy
  • Neuroscience
  • Biomechanics

Background:

  • The human vocal cord's complex structure facilitates voice production.
  • Understanding the sensory innervation of the vocal cord is crucial for voice biomechanics.

Observation:

  • Encapsulated nerve structures with abundant axon terminals were identified in the m. vocalis and cartilaginous vocal cord.
  • These axon terminals lack Schwann sheaths and interface directly with collagen fibers, suggesting mechanoreceptor function.

Findings:

  • Nerve structures in the m. vocalis contain striated muscle fibers, resembling Golgi tendon organs, potentially sensing muscle tension.
  • Nerve structures in the cartilaginous vocal cord, located submucosally, may detect contact between vocal cords during glottis closure.

Implications:

  • These findings suggest novel mechanoreceptors in the vocal cord that monitor rigidity and tension.
  • This sensory feedback may play a role in regulating vocal fold vibration and preventing injury.

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