The vibratory soft tissues in the primary bronchi. (A) Lateral view onto the lateral labium (LL, orange) of the male right hemisyrinx. Cartilaginous tissue (blue) extends from bronchial half-rings B2 and B3. The MVC (blue), a large cartilaginous pad, extends from B2 and bends medially. (B) Same structure as in A, but turned 180° around the vertical axis, providing a medial to lateral view onto the LL. The LL is connected to the medial side of bronchial half-ring B3 and is thickened in two bands (asterisks). (C) Same medial view as in B onto right LL of freshly dissected male right hemisyrinx (MVM removed). (D) Caudal view onto left LL of left hemisyrinx with left primary bronchus removed. (E) Lateral view on the medial vibratory mass (MVM, pink), the tissue continuum comprising ML and medial tympaniform membrane (MTM). Bronchial half-ring B3 is removed for an unobscured view onto the MVM, which attaches to the pessulus (PES) and forms the medial wall of the primary bronchi. (F) Same structure as in E, but turned 180° giving a medial to lateral view. The MVC is embedded in the ventral part of the MVM, as well as two small other cartilaginous pads: the medial dorsal cartilage (MDC) and the lateral dorsal cartilage (LDC). (G) Same view as in F of a freshly dissected right hemisyrinx with the musculature left intact. (H) Surface renderings of the ventral and (I) dorsal half of the internal bone structure of the syrinx with sound-producing labia. Abbreviations as listed in Table 1.