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How we Hear

Cross-section of the human ear (Image courtesy of www.avalonhearing.ca)
The Outer Ear
Location:  
This part of the ear is the fleshy attachment at the sides of our head and the ear canal which leads to the ear drum.
The Outer Ear
Sound:
Sound is collected and reflected off the pinna walls and directed down the canal towards the eardrum.
The Middle Ear
Location:  
This is the air-filled cavity behind the eardrum.  It contains the ossicles and is connected to the throat via the Eustahcian tube.
The Middle Ear
Sound:
When the eardrum vibrates from sound, these tiny vibrations are transferred through the ossicles to the inner ear.
Inner Ear
Location:  
This section begins at the oval window, through the fluid filled Cochlea and on to the hearing nerve to the brain.
The Inner Ear
Sound:
The mechanical vibrations at the oval window are converted into electrical impulses which are identified as sounds.