[TA] intrinsic muscle of larynx; origin, inner surface of thyroid cartilage in common with the thyroarytenoideus muscle; insertion, aryepiglottic fold and margin of epiglottis; action, depresses base of epiglottis; nerve supply, recurrent laryngeal. SYN: pars thyroepiglottica musculi thyroarytenoidei [TA], depressor muscle of epiglottis, musculus thyroepiglotticus, thyroepiglottic muscle, thyroepiglottidean muscle, ventricularis (2).