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How we Hear

Cross-section of the human ear (Image courtesy of www.avalonhearing.ca)
The Outer Ear
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 is collected and reflected off the pinna walls and directed down the canal towards the eardrum.
The Middle Ear
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
When the eardrum vibrates from sound, these tiny vibrations are transferred through the ossicles to the inner ear.
Inner Ear
This section begins at the oval window, through the fluid filled Cochlea and on to the hearing nerve to the brain.
The Inner Ear
The mechanical vibrations at the oval window are converted into electrical impulses which are identified as sounds.