Figure 2. Schematic drawing of the laryngotracheal specimen in sheep, opened at midline, anteriorly. A = anterior midline; a = epiglottis; b = thyroid cartilage; c = cricoid cartilage; d = arytenoid cartilage; L = left; P = posterior midline; R = right. Sections for microscopic examination were taken at different levels: 1 = epiglottis; 2 = arytenoid; 3 = vocal cord; and 4 = trachea. Samples taken from the trachea were cut longitudinally and involved four tracheal rings. (Modified. [18]).