Chapter 11 The Auditory System Blanked out

Chapter 11 The Auditory System Blanked out - The Auditory...

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Sheet1 Page 1 The Auditory System Chapter 11, but not the vestibular system (skip pages 376-384) s me at office hours if you need help m Sound = variations in air pressure S Overview of the auditory system O The outer ear focuses sound onto the ear drum h The outer ear is also used for localizing sound in the _________ plane h Bumps and ridges in outer ear reflect entering sound h Delay between direct path and reflected path changes as sound source moves vertically s The middle ear contains the ossicles: malleus, incus, stapes c A loud sound triggers the attenuation reflex h Second Exam on Thursday (March 13th) h Today: Auditory System h Monday: Somatic Sensory System h Thursday next week: exam h No review session before the exam h come and see h Frequency of wave = ________, expressed in cycles/sec. (Hz) h Amplitude of wave = _________, expressed in dB h Increases _________ to overcome energy loss at air-fluid boundary h Air has low resistance to movement, fluid has a high resistance h Large diameter tympanic membrane, small diameter oval window h Lever action of bones in middle ear
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Sheet1 Page 2 h When muscles attached to the ossicles contract, sound conduction to middle ear is ________ h But delay in reflex prevents it from protecting the ear from sudden loud sounds, like explosions h Attenuation reflex also active when we speak, to reduce sound of our own voice o The inner ear h Energy from pressure wave is transformed into neural impulses h Basilar membrane vibrates in response to sounds h Fluid in scala tympani is called perilymph. It has ionic concentrations similar to extracellular fluids elsewhere in the brain: h Low ____ , high ____ h Fluid in scala media is called endolymph. It is an unusual extracellular fluid that has ionic concentrations similar to intracellular fluids h High ____ , low ____ H Basilar membrane varies in width and flexibility along its length
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This note was uploaded on 04/03/2008 for the course NEUROBIOLO Fund Neuro taught by Professor Schjott during the Spring '08 term at Rutgers.

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Chapter 11 The Auditory System Blanked out - The Auditory...

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