Figure 53-14. The rima glottidis (in yellow) and the vocal ligaments in (A) phonation, (B) forced inspiration, and (C) quiet respiration. Note the rotation and lateral sliding of the arytenoid cartilages and the different shapes of the glottis. D, Muscles of the larynx seen from above. The white arrows Land P show the direction of action of the lateral and posterior crico-arytenoid muscles, respectively. The black arrows show the direction of action of the transverse arytenoid muscle. M, muscular process of the arytenoid cartilage; V, vocal process of the arytenoid cartilage. It should be noticed that the apex of the A formed by the vocal ligaments is located anteriorly. Click for high resolution image.