Related Experiment Video
Updated: May 1, 2026

Preparation of the Rat Vocal Fold for Neuromuscular Analyses
Published on: May 15, 2020
Anatomical localization of the motor entry point in the thyroarytenoid muscle
Soo Yeon Kim1, Dae Heon Song, Myung Eun Chung
1Department of Rehabilitation Medicine, St. Paul's Hospital, College of Medicine, Catholic University of Korea, Jeonnong-Dong, Dongdaemoon-Gu, Seoul, 130-709, Republic of Korea.
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.
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