| 11. | It has been estimated that about 30 % of people with Meniere's disease have eustachian tube dysfunction.
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| 12. | Major causes are ear infections or conditions that block the eustachian tube, such as allergies or tumors.
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| 13. | The Eustachian tubes, passages that connect the middle ear with the pharynx, are very complex in crocodilians.
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| 14. | In fact, the eustachian tubes are not located close enough to the mandible to be pinched off.
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| 15. | The Eustachian tube, which opens near the velopharyngeal sphincter, connects the middle ear and middle ear infections.
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| 16. | The Eustachian tube connects from the chamber of the middle ear to the back of the nasopharynx.
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| 17. | Normally, the Eustachian tube is collapsed, but it gapes open both with swallowing and with positive pressure.
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| 18. | The eustachian tubes help the ear to drain and balance pressure on the inner and outer ear.
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| 19. | You also get a similar effect by yawning, since the yawning mechnaism also involves the eustachian tubes.
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| 20. | But during a steep descent, pressure that builds up outside the body can push the eustachian tube closed.
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