| 21. | Clearance of keratin can be disrupted by tympanic membrane retraction so that keratin accumulates within the retraction pocket.
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| 22. | If there is less inflammation, the cholesteatoma may present the appearance of'semolina'discharging from a defect in the tympanic membrane.
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| 23. | The apex of the cone is at the most depressed part of the tympanic membrane, known as the umbo.
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| 24. | Pakicetids could hear under water, using enhanced bone conduction, rather than depending on tympanic membranes like most land mammals.
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| 25. | In 1855 Rinne described the combined conductive process of the tympanic membrane and the ossicles of the middle ear.
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| 26. | As the nerve travels between the brain and the tongue, it passes right under the eardrum, the tympanic membrane.
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| 27. | Shining light on the tympanic membrane causes a cone-shaped reflection of light to appear in the anterior inferior quadrant.
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| 28. | Tympanic membrane retraction is fairly common and has been observed in one quarter of a population of British school children.
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| 29. | When a tympanic membrane is concave does it remain so or does it self-correct over time or require medical intervention?
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| 30. | Attempts have been made to categorise the extent of tympanic membrane retraction though the validity of these classifications is limited.
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