Lec16 - Neurobiology VI - Lecture 16 Nervous System VI: The...

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Lecture 16 Nervous System VI: The Sensory System Reading: Chapter 6, 275 - 280 Lecture Outline: Hearing
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Hearing
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The Outer Ear Pinna: Acts as a funnel to receive sound waves. Tympanic membrane (ear drum): Vibrates with the same frequency as the sound waves.
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The Middle ear Vibrations of tympanic membrane are transmitted through the middle ear bones - malleus, incus and stapes to the oval window -junction of middle and inner ear. Malleus Incus Stapes Tympanic membrane Oval window
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The size difference between the tympanic membrane and the oval window increases the amount of vibration. Vibrations increase ~ 17 times. Three bones provide levering action. The net amplification of sound ~ 22 fold. Amplification of sound
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The three bones of middle ear transmit the mechanical pressure to the oval window. The vibrations of oval window produce pressure waves in the fluid within the cochlea. Cochlea The Inner Ear – Cochlea
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Cochlea has two large chambers - Vestibular canal and Tympanic canal. These chambers are filled with fluid – perilymph. These chambers are separated by cochlear duct that is filled with endolymph. Cochlea uncoiled
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Cochlea has two ends Base and Apex. Apex
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Lec16 - Neurobiology VI - Lecture 16 Nervous System VI: The...

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