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Air conduction 
sound waves move through the air in the external auditory canal, hit the tympanic membrane (TM) and cause the tympanic membrane to move. 
​- 3 bones in the middle ear (the malleus, the incus, and the stapes) are connected to the TM. When the TM moves, it is transmitted to the bones. These movements cause pressure waves in the fluid-filled inner ear. 
- The cochlea in the inner ear is surrounded by fluid and contains multiple small hairs. Pressure waves in the fluid cause the ha...