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Middle Ear - Anatomy of the Ear Middle Ear(Cavity between...

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Anatomy of the Ear Middle Ear ( Cavity between tympanic membrane and cochlea) * Malleus * Attached to tympanic membrane. * Vibrations of membrane are transmitted to the stapes. * Incus : * Anvil. * Stapes : * Attached to oval window. * Vibrates in response to vibrations in tympanic membrane. Muscles of the Middle Ear * Stapedius * the smallest skeletal muscle in the human body. * connects to the stapes (the stirrup) * when it contracts, it reduces the action of the stapes (i.e., it reduces amplification) * contracts just before speaking and chewing because our own speaking and chewing actually could be loud enough to damage the sensitive mechanisms of the inner ear if the sounds were further amplified. * innervated by a branch of the Facial Nerve (CN VII). Muscles of the Middle Ear * Tensor tympani * inserts on the malleus and acts to tense the tympanic membrane reducing the effectiveness of sound transmission, protecting the inner ear during loud sounds.
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