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3BHow Your Hearing Works
THE INNER EAR
As we continue our journey into the ear, let’s revisit what we have
already discussed. Sounds created by compression and rarefaction in
the atmosphere are collected by our ears - namely the pinnae or
external protrusion of the outer ear. This sound travels down the
funnel-like ear canal until it reaches the ear drum. This tympanic
membrane vibrates in response to the moving air particles that make up
sounds waves. This vibration puts into motion the Ossicles - the tiny
bone structures that transfers the mechanical energy of sound and
amplifies it as it passes through each in turn: the malleus, the incus, and
the stapes. Once the stapes receives the amplified vibrations, it impacts
the cochlea and brings us to the inner ear.
Up to this point, all sound has been traveling through air. But at the
inner ear, sound will encounter fluid for the first time and the way in
which it travels to the brain changes dramatically. The inner ear is
commonly referred to as the labyrinth due to the shell-like cochlea that
makes up the space. Much of the work of hearing is done in the inner
ear, and it is the last stop for sounds as they make their way to the brain
in the form of information.
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