出典:Wiktionary
upper respiratory tract (複数形 upper respiratory tracts)
出典:Wikipedia
出典:『Wikipedia』 (2011/03/19 18:05 UTC 版)
The upper respiratory tract or upper airway primarily refers to the parts of the respiratory system lying outside of the thorax or above the sternal angle. Another definition commomly used in medicine is the airway above the glottis or vocal cords. Some specify that the glottis (vocal cords) is the defining line between the upper and lower respiratory tracts; yet even others make the line at the cricoid cartilage..