The middle ear extends from the ear drum across the upper extent of the eustation tube (drains into the back of the throat) to the round window of the cochlea. Crossing that gap are the three smallest bones in your body, whose job it is to carry and amplify the vibrations of the ear drum to the cochlea. Those bones are commonly known as the hammer, anvil and stirrup, since they resemble those items. Some cases of hearing loss are called "conductive" because the sound is not detected by the ear drum or properly conducted across the eustation tube. Many times such hearing losses can be corrected, now.
The NCSHHH web site has an exclusive 3D model of an inner ear that you can view and interact with on your computer if you would like ...Find Out How