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Ear canal
The ear canal (external auditory meatus, external acoustic meatus, EAM) ((ラテン語:meatus acusticus externus)), is a tube running from the outer ear to the middle ear. The adult human ear canal extends from the pinna to the eardrum and is about in length and in diameter.
== Structure==
The human ear canal is divided into two parts. The elastic cartilage part forms the outer third of the canal, Its anterior and lower wall are cartilaginous, whereas its superior and back wall are fibrous. The cartilage is the continuation of the cartilage framework of pinna. The bony part forms the inner two thirds. The bony part is much shorter in children and is only a ring (''annulus tympanicus'') in the newborn.
Size and shape of the canal vary among individuals. The canal is approximately long and in diameter.〔Faddis, B. T. (2008). "Structural and functional anatomy of the outer and middle ear". In W. Clark & K. Ohlemiller (Eds.), ''Anatomy and physiology of hearing for audiologists'' (pp. 93–108). Thomson Delmar Learning.〕 It has a sigmoid form and runs from behind and above downward and forward. On the cross-section, it is of oval shape. These are important factors to consider when fitting earplugs.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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