Human eardrum. Credit: The Cleveland Clinic.
The eardrum, known medically as the tympanic membrane or myringa,
is the thin membrane that separates the outer
ear from the middle ear. The eardrum
vibrates in response to sound waves and transmits
these vibrations via the auditory ossicles of the middle ear to the cochlea of the inner ear.
In amphibians and some reptiles, there is no outer ear and the eardrum lies at, or very close to, the surface of the skin.