The Outer Ear-

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Last updated 5:01 AM on 4/4/25
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12 Terms

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Functions of the human ear

Hearing and Balance.

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Auditory system

Senses sound.

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Vestibular system

Manages balance.

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Average length of adult ear canals

2.54 cm, ranging from about 2.3 cm to 2.9 cm.

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Frequency range of most ear canals

Resonate between 1500 and 4000 Hz, with an average of 2700 Hz.

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Gain of the ear canal

16 dB.

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Vagus nerve (cranial nerve X)

Located at the bottom of the ear canal, touching it can trigger Arnold's reflex.

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Arnold's reflex

An automatic cough triggered by touching the vagus nerve in the ear canal.

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Measurements of the tympanic membrane

About 9 mm high and 8 mm wide.

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Function of the annular ring

Holds the tympanic membrane in place, creating a watertight and airtight seal.

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Effect of acoustic energy on tympanic membrane

Causes the TM to vibrate in response to sound.

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Bends in the ear canal

Two bends; the first is near the aperture, and the second follows shortly after.