Outer ear
The outer ear is the starting point of the physiological mechanism of the Audition.
It is mainly made up of the house ( fucked ), the great part which is used to collect and to concentrate the sound waves. Certain mammals can move the house to direct their hearing, just like they can turn the eyes. The human beings for the majority lost this capacity. But the human house amplifies few decibels the frequencies around 2000 Hz and the acuter frequencies around 3000 Hz will be also amplified by the external auditory canal.
House, the sound follows the external auditory canal , a tube which leads to the middle ear . This part of the ear secretes the Cérumen to protect itself.
The house itself is composed of, in its center a depression, called the conch. The most external pad is called the hélix which starts in top by the root of the hélix and finished by the lobule (only nonfibrocartilagineuse part of the house), the second pad located between the conch and the hélix, is called the antélix which starts by a posterior root and former. Between the two roots, a depression: the small cavity naviculaire. Finally before with the conch the tragus.
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