thyroepiglottic muscle thyroepiglottic muscle a considerable number of the fibers of the thyroarytenoid muscle are prolonged into the aryepiglottic fold, where some of them become lost, while others continue to the margin of the epiglottis. they have received a distinctive name, thyroepiglotticus or thyroepiglottic muscle, and are sometimes described as a separate muscle. this muscle's function is to widen the laryngeal inlet. thyroepiglottic musclemuscles of the larynx, seen from above.detailsnerverecurrent laryngeal nerveidentifierslatinpars thyreoepiglottica musculi thyreoarytaenoideita98a06.2.08.009ta22201fma46594anatomical terms of muscle