The Ossicles
The three tiniest bones in the body form the coupling between the vibration of the eardrum and the forces exerted on the oval window
of the inner ear.
With a long enough lever, you can lift a big rock with a small applied force on the other end of the lever. The amplification of force can be changed by shifting the pivot point.
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The ossicles can be
thought of as a
compound lever
which achieves a
multiplication of
force. This lever
action is thought
to achieve an
amplification by a
factor of about three under optimum conditions, but can be adjusted by muscle action to actually attenuate the sound signal for protection against loud sounds. |
A physiology book describes the ossicles as the smallest bones int he body, small enough to fit collectively on a U.S. dime. |
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Index
Hearing concepts |