Tympanal organ
HEARING ORGAN IN INSECTS, CONSISTING OF A MEMBRANE (TYMPANUM) STRETCHED ACROSS A FRAME BACKED BY AN AIR SAC AND ASSOCIATED SENSORY NEURONS
A tympanal organ (or tympanic organ) is a hearing organ in insects, consisting of a membrane (tympanum) stretched across a frame backed by an air sac and associated sensory neurons. Sounds vibrate the membrane, and the vibrations are sensed by a chordotonal organ.