Syringeal muscles and their attachment sites in the male and female zebra finch syrinx morphome. (A) Ventral view of the male zebra finch syrinx morphome based on an iodine-stained μCT scan showing muscles, bones, cartilaginous pads, and sound-producing labia. (B) Ventro-lateral view with transparent right ventral muscles VS and SVTB, revealing the underlying DVTB. (C) Attachment sites of the syringeal muscles seen from ventral and (D) ventro-lateral. The dotted line indicates the location of the CASM on which several muscles insert. (E) Dorsal view of the male zebra finch syrinx morphome. (F) Ventro-lateral view with transparent right dorsal muscles SVTB and LDS, revealing the DDS and DVTB. (G) Attachment sites of the syringeal muscles seen from dorsal and (H) dorso-lateral. (I) Ventral view of the female zebra finch syrinx morphome showing muscles, bones, cartilaginous pads and sound-producing labia. The muscles VS, SVTB and DVTB on the right hemisyrinx are transparent. (J) Dorsal view with left MDS and DTB transparent. (K) Muscle attachment sites seen from ventro-lateral and (L) dorso-lateral view. Abbreviations as listed in Table 1. DDS: yellow; DTB: orange; DVTB: dark green; LDS: neon green; MDS: violet; ST: blue; STB: cyan; SVTB: light green; VS: purple.