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The tragus is a small pointed eminence of the external ear, situated in front of the concha, and projecting backward over the meatus. It also is the name of hair growing at the entrance of the ear.〔("Why do older men have hair growing in their noses and ears?" ) from ''The Straight Dope''〕 Its name comes from the Greek: ''tragos'', goat, and is descriptive of its general covering on its under surface with a tuft of hair, resembling a goat's beard. The nearby antitragus projects forwards and upwards.〔(【引用サイトリンク】url=http://www.thefreedictionary.com/antitragus )〕 Because the tragus faces rearwards, it aids in collecting sounds from behind. These sounds are delayed more than sounds arriving from the front, assisting the brain to sense front vs. rear sound sources. In a positive fistula test (for the presence of a fistula from cholesteatoma to the labyrinth), pressure on the tragus causes vertigo or eye deviation by inducing movement of perilymph.〔(【引用サイトリンク】url=http://www.harleystreetent.com/balance/diagnostics/fistula-test/ )〕 ==Additional images== File:Gray908.png|Horizontal section through left ear; upper half of section. File:Slide2COR.JPG|External ear. Right auricle.Lateral view. File:Slide4COR.JPG|External ear. Right auricle.Lateral view. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Tragus (ear)」の詳細全文を読む スポンサード リンク
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