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Friday 13 January 2012

The middle - Our Hearing

At the end of the ear is the eardrum which the outer ends and the middle ear begins.
 
The eardrum is the handle of the hammer (malleus) fused. The hammer head attached in turn to the anvil (incus), which in turn is connected to the bottom of the stirrup (stapes). These three smallest bones in the human body, the ossicles or ear bone called chain. They are connected by a small joint articulate and ensure the transfer of sound vibrations to the inner ear. The footplate of the stapes is a valve of the oval window, the door of the inner ear.
 
Normal eardrum
Hole in the eardrum
ooronsteking
Normal eardrum
Hole in the eardrum
Otitis
 
The cavity in which the ossicles hang with ligaments and muscles, also called the tympanic cavity is filled with air. This cavity is through the Eustachian tube connected to the nasopharynx and thus with the air. The Eustachian tube ensures that the air pressure in the middle of the atmosphere remains constant. To loud sounds and noises that man produces himself to be dampened by this principle.

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