the  ____________  that vibrates like a drum when sound waves hit.
Hearing is all about the vibrations of sound as they hit our ears. Inside the outer ear â or that part we all see â is a complex series of ear parts that also vibrate when sound hits them. The eardrum is a drum shaped part that vibrates with the sound waves as they hit it. Behind the eardrum is the snail shaped piece that also regulates balance called the cochlea and three small bones: the hammer, the anvil, and the stirrup.