Anatomical localization of the motor entry point in the thyroarytenoid muscle

Soo Yeon Kim, Dae Heon Song, Myung Eun Chung

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Introduction: The aim of this study was to localize the motor entry point (MEP) of the thyroarytenoid muscle. Methods: Eight cadaver larynges were dissected. A virtual plane was used to represent the MEP in a coordinate (X/Y/Z) system. The inferior border of the thyroid cartilage was linked to the center of the anterior arc of the cricoid cartilage (the Y-axis). The X-axis was set perpendicular to the Y-axis; the Z-axis passed through the posterior border of the thyroid lamina from the height of the insertion point. Results: The mean X, Y, and Z coordinates were 6.2 mm, 9.1 mm, and 11.0 mm, respectively. The calculated angles of the lateral and superior deflections were 29.4° and 35.8°, respectively. The calculated insertion depth, that is, the distance from the insertion point to the MEP, was 15.6 mm. Conclusions: These results may help to improve the accuracy of needle insertion during diagnostic laryngeal electromyography or laryngeal electromyography-guided injections.

Original languageEnglish (US)
Pages (from-to)72-75
Number of pages4
JournalMuscle and Nerve
Issue number1
StatePublished - Jan 1 2015
Externally publishedYes


  • Laryngeal electromyography
  • Motor entry point
  • Spasmodic dysphonia
  • Thyroarytenoid muscle
  • Vocal cord immobility

ASJC Scopus subject areas

  • Physiology
  • Clinical Neurology
  • Cellular and Molecular Neuroscience
  • Physiology (medical)


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