The phrase "tympanic membrane" refers to the thin layer of tissue in our ears that vibrates when sound waves hit it. It helps us hear and transmit sound signals to the inner ear. Full definition
Each front leg exhibits a single ear below the knee with two eardrums (also known as tympanic membranes), which are backed by a narrow cylindrical tube (the acoustic trachea) running along the leg internally and opening out on the side of the insect's body. (sciencedaily.com)
CONTRAINDICATIONS: Do not use in dogs with known tympanic membrane perforation (see PRECAUTIONS on label). (petbasics.com)
Untreated otitis media can lead to otitis interna (inflammation of the inner ear structures) or to rupture of an intact tympanic membrane with subsequent otorrhea or otitis externa. (merckvetmanual.com)