Here's how it works:
1. Sound waves enter the ear canal and cause the tympanic membrane (eardrum) to vibrate.
2. The vibrations are transferred from the tympanic membrane to the malleus (hammer), the first of the three ossicles (tiny bones) in the middle ear.
3. The malleus then passes the vibrations to the incus (anvil), the second ossicle.
4. Finally, the incus transmits the vibrations to the stapes, the smallest bone in the body.
5. The stapes, which is attached to the oval window, a membrane-covered opening in the inner ear, transmits the vibrations to the fluid inside the cochlea.
This chain of events allows the sound waves to be amplified and transmitted into the inner ear, where they are converted into electrical signals that the brain interprets as sound.