Abstract
Three-dimensional computer graphics and computer simulation should be useful to clarify the relationship between the three-dimensional movement of the arytenoid cartilage and the contraction power of the internal laryngeal muscles. The literature is reviewed in an attempt to clarify this relationship.
It is necessary to identify both the three-dimensional structure of the crico-arytenoid joint and the direction of the internal laryngeal muscle fibers by observation of the threedimensional computer graphics reconstructed from cross sections of the larynx. It is also necessary to draw the glottal shape transformed by electrical stimulation, using computer graphics, and to calculate the contraction power of the laryngeal muscles, using three-dimensional vector analysis. Then it will be possible to simulate the relationship between the condition of the internal laryngeal muscles and the position of the arytenoid cartilage.
The computer simulation of the glottal shape should make it possible to know the condition of the internal laryngeal muscles in phonation.
