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Changes: External ear

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{{enWP|Outer ear}}
 
{{enWP|Outer ear}}

Latest revision as of 09:09, May 2, 2009

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External ear
Gray907
External and middle ear, opened from the front. Right side.
Latin '
Gray's subject #229 1033
System {{{System}}}
MeSH A09.246.272
Gray904
The auricula. Lateral surface.

The outer ear is the external portion of the ear.

Pinna, or auricleEdit

The visible part is called the pinna and functions to collect and focus sound waves. Many mammals can move the pinna (with the auriculares muscles) in order to focus their hearing in a certain direction in much the same way that they can turn their eyes. Humans, unlike most other mammals, do not have this ability....

Ear canal, or external auditory meatusEdit

From the pinna the sound pressure waves move into the ear canal, a simple tube running to the middle ear. This tube amplifies frequencies in the range 3 kHz to 12 kHz.


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