Eardrum vibrations are amplified mechanically by lever action and are transferred to the inner ear by means of the ossicles ​ — tiny bones known as the hammer, the anvil, and the stapes.
Trummikile vibratsioonid võimenduvad mehaaniliselt nookuvmeetodil ja kanduvad sisekõrva kuulmeluukeste abil, mida tuntakse vasara, alasi ja jalusena.