The Effect of the intrinsic laryngeal muscles to the glottis were studied in excised human larynges. The following results were obtained: 1. In the cadaver, the glottis has a waterdrop shape. 2. During vocal fold abduction, the glottis has a pentagonal shape. 3. The ratio of the area of the anterior glottis to that of the posterior glottis is approximately 2 to 3 in both cadaver position and abduction. 4. The thyroarytenoid muscle and the lateral cricoarytenoid muscle are able to close from the anterior commisure to the posterior edge of the ventricle. The glottis does not close from the edge of the ventricle to the posterior wall of the glottis at the level of the vocal fold. 5. The cricothyroid muscle is able to change not only the shape of anterior glottis but also the shape of posterior glottis.
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