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How You Hear

How you hear, anatomy of the earThe Outer Ear

Hearing begins when sound waves enter the outer ear (the visible portion of the ear located on the outside of the head) and are channeled down the auditory or ear canal, a tube-like passageway lined with tiny hairs and small glands that produce earwax.

The Middle Ear

At the end of the auditory canal lies the ear drum (tympanic membrane) and the middle ear. Within the middle ear cavity is contained the ossicles, the three small bones, known commonly as the hammer, the anvil, and the stirrup. When sound waves hit the eardrum, it vibrates and, in turn, moves the hammer. The hammer moves the anvil, which moves the stirrup, transmitting and amplifying the vibrations into the inner ear. The middle ear functions to amplify sound, which is why significant hearing loss can result from any damage to any of its parts.

The Inner Ear

The inner ear consists of the cochlea and the vestibular (balance) system. The cochlea is the organ that converts sound waves into nerve impulses that the brain can understand. Those nerve impulses travel to the auditory centre of the brain, it is the brain that allows you to hear. It is in fact within the brain that we really hear, the auditory system is just a conduit that channels exterior sound to the brain. Hearing loss typically occurs when some part of this conduit is damaged. 


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