middle ear
"The middle ear is like an amplification chamber. When a sound wave vibrates the ear drum ), the sound is transmitted by the little bones to the inner ear and then the nerve impulse is sent to the brain. "
"The middle ear is like a biconcave lens. It is filled with air and houses the malleus, incus and stapes, which transmit sound waves from the tympanic membrane "
"If hearing is like a road, with the sound at one end traveling down the road to the brain, the middle ear is like a tunnel that the road travels through. It connects the outside and the inner ear."
"For the ear, which is a transducer of sorts, there are several transformers of note. The ear drum changes acoustic energy to mechanical. The middle ear is like a series of levers that acts as a pure-mechanical transformer. The end of these levers connect to the inner ear where it transforms again into acoustical energy."
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