Brown Thrasher (Toxostoma rufum) Science Article 9
Our current understanding of the soundgenerating mechanism in the songbird vocal organ, the syrinx, is based on indirect evidence and theoretical treatments. The classical avian model of sound production postulates that the medial tympaniform membranes (MTM) are the principal sound generators.
FRANZ GOLLER AND OLE N. LARSEN, Proc. Natl. Acad. Sci. USA Vol. 94, pp. 14787-14791