Figure 2

Schematic representation of the supporting elements of the linguo-laryngeal apparatus of S. camelus . Dorsal view. The cricoid and procricoid cartilages as well as the tongue root and fleshy lips of the glottis are omitted for clarity. The caudal aspect of the arytenoid cartilages (Ar) are not joined as indicated but separated by the procricoid cartilage (not illustrated). Red indicates bone and blue/purple cartilage as seen in a 2 week-old chick. a: Resting relationship (see Figure 1a) of the arytenoid cartilages, tongue body (T), urohyal (U), body of the basihyal (Bb), rostral projection of the basihyal (Rpb), paraglossalia (P), glottis (G), rostral laryngeal projection (black star), lingual papilla (black arrow) and ceratobranchials (Cb). b: The relationship of the underlying structures following retraction of the tongue (see Figure 1c). Note how the rostral portions of the arytenoid cartilages are enclosed in the tongue pocket and how the lingual papillae hook over the rostral laryngeal projections. The glottis appears open as the soft tissue (see Figures 1a-c) has not been included in the sketch.