Apr 6, 2014
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EUSTACHIAN TUBES

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The passages, one on each side, leading from the throat to the middle ear. Each is about 38 mm (1••• inches) long and is large at either end, though at its narrowest part it only admits a fine probe. The tubes open widely in the act of swallowing or yawning. The opening into the throat is situated just behind the lower part of the nose, so that a catheter can be passed through the corresponding nostril into the tube for inflation of the middle ear. (See also EAR; NOSE.)

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Medical Dictionary

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