3. Cicada sound structures
The tymbal muscles were further isolated and are illustrated in 3D volume and 2D cross-sections. These muscles connect to the tymbal, a corrugated exoskeletal structure, to produce the characteristic cicada song. The tymbal muscles account for only 2.91% of the entire cicada (solid parts, such as chitin shell, muscles, wings, and legs), however, they are very good at making big sounds.