| 1. | The device sends 44 different sonar frequencies down the ear canal.
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| 2. | The smallest aids are those that fit in the ear canal.
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| 3. | The ear canal ends at the external surface of the eardrum.
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| 4. | Dogs also have numerous apocrine glands in their external ear canals.
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| 5. | Without treatment it can lead to narrowing of the ear canal.
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| 6. | His phonautograph was constructed as an ear canal, eardrum and ossicles.
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| 7. | The ear canal amplifies sounds that are between 3 and 12 kHz.
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| 8. | Aspergillosis of the ear canal causes itching and occasionally pain.
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| 9. | This shows the infection has spread beyond the ear canal.
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| 10. | Rotate the animal's head gently and look into the ear canal.
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