1. Sound waves enter the external auditory canal and cause vibrations in structures and fluids of the ear. Identify in order the structures and fluids that vibrate in the pathway from the external auditory canal to the spiral organ of Corti.
2. Describe a series of movements that would stimulate all semicircular duct receptors and if repeated may cause vertigo. (Hint: Think of a carnival ride that causes vertigo.)
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1. Auricle directs sound waves into the external auditory canal. The sound waves arrive at the tympanic membrane causing it to vibrate. Movement of the eardrum causes displacement of the auditory ossicles and the ossicles amlify the vibration of the tymbanic membrane. Movement of the stapes at the oval window establishes pressure waves in the perilymph of the vestibular duct.
2. intense episode of vertigo can be triggered by a specific change in the position of the head. You feel as if you're spinning when you bend down to look under something, tilt your head to look up or over your shoulder, or roll over in bed.
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Oct 8th, 2015
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