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[Functional structure of the human vocal cord]

G Friedrich1, J Kainz, W Freidl

  • 1Hals-, Nasen-, Ohren-Universitätsklinik Graz.

Laryngo- Rhino- Otologie
|May 1, 1993
PubMed
Summary

This study reveals five distinct portions of the glottis, with significant sex-related differences in vocal cord dimensions. The vibrating midportion of the vocal cord is longer in men, potentially explaining voice pitch variations.

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Area of Science:

  • Anatomy
  • Laryngology
  • Biomechanics

Context:

  • The human larynx and glottis structure are crucial for voice production.
  • Understanding sex-based anatomical differences is key to explaining vocal characteristics.

Purpose:

  • To histologically divide the glottis into functional portions.
  • To analyze sex-related differences in glottic dimensions and their functional implications.

Summary:

  • The glottis can be divided into five distinct portions: vocal cord midportion, anterior/posterior transition zones, vocal process, and posterior glottis lateral wall.
  • Significant sex differences exist in the length of the posterior glottis (relatively longer in women) and the vocal cord midportion (absolutely longer in men).
  • The longer, vibrating vocal cord midportion in men may explain the 1:2 fundamental frequency ratio between sexes, despite similar laryngeal dimensions.

Impact:

  • Provides a novel histological and functional subdivision of the glottis.
  • Offers insights into the anatomical basis of sex-related differences in voice pitch.
  • Highlights the mechanical strain on the vocal process during vocal cord movement.

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