- published: 01 Mar 2016
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The auditory system is the sensory system for the sense of hearing.
The folds of cartilage surrounding the ear canal are called the pinna. Sound waves are reflected and attenuated when they hit the pinna, and these changes provide additional information that will help the brain determine the direction from which the sounds came.
The sound waves enter the auditory canal, a deceptively simple tube. The ear canal amplifies sounds that are between 3 and 12 kHz. At the far end of the ear canal is the eardrum (or tympanic membrane), which marks the beginning of the middle ear.
Sound waves traveling through the ear canal will hit the tympanic membrane, or eardrum. This wave information travels across the air-filled middle ear cavity via a series of delicate bones: the malleus (hammer), incus (anvil) and stapes (stirrup). These ossicles act as a lever and a teletype, converting the lower-pressure eardrum sound vibrations into higher-pressure sound vibrations at another, smaller membrane called the oval (or elliptical) window. The malleus articulates with the tympanic membrane via the manubrium, where the stapes articulates with the oval window via its footplate. Higher pressure is necessary because the inner ear beyond the oval window contains liquid rather than air. The sound is not amplified uniformly across the ossicular chain. The stapedius reflex of the middle ear muscles helps protect the inner ear from damage. The middle ear still contains the sound information in wave form; it is converted to nerve impulses in the cochlea.
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She can do anything
What does she see in me
I wouldn't change a thing
I no longer feel so empty
So I'm listening
No words that I can hear
But I'm seeing
For the first time things are clear
But I'd still like to know
What do I do for you
Wanna be a part of me
Take all you see
Anything of me
I've been in love
And I held on to it's bliss
Never realized
That this kind of love exists
So I'm listening
Your words are what I hear
You have shown me
It's so simple when your near
I've been in love
And I hold on to it's bliss
Now I realize
That this kind of love exists
I'm listening