Shared Flashcard Set

Details

Peripheral Auditory system 2
Science of Human Comm FInal
15
Science
Undergraduate 2
12/12/2010

Additional Science Flashcards

 


 

Cards

Term
Describe Tonotopic Organization. Where does it occur?
Definition
-it is frequency organized by place among basilar membrane
Term
What contributes to tonotopic organization?
Definition
-MECHANICAL properties of Basilar Membrane
Term
2 Mechanical Properties of Tonotopic Organization
Definition
STIFFNESS GRADIENT-bass stiff, apex less stiff
WIDTH- base is narrow, apex is wide
Term
Describe the Conversion of Mechanical Movement to Electrical Impulses
Definition
-As BM vibrates, so does Organ of Corti (sensory organ of hearing)
-Organ of Corti includes *hair cells that are sensory receptors that transduce mechanical motion to electrical charge
Term
Whats the organ of Hearing? What 2 things does it consists of?
Definition
Organ of Corti aka spiral organ
-hair cells (4 rows) w/ stereocilia protruding from the top
-Tectorial membrane
Term
Describe the 4 rows of hairs cells in the Organ of Corti...and cell count?
Definition
-1 inner row (3500 cells)
-3 outer rows (12000 cells)
Term
Describe the Tectorial Membrane in the Organ of Corti
Definition
Gelatinous structure that overlays hair cells and stimulates them upon acoustics events
Term
Inner hair cells functions
Definition
-transduce mechanical energy vibration into an electrical signal
Term
Outer hair cells function
Definition
shrink and expand to fine tune (amplify) the frequency response of the cochlea
-they vibrate!
Term
Sterocilia
Definition
-connected w/ a filamentous process called "tip link"
-"tip link" connects from distal end of Sterocilia to the side of the longest adjacent one
-tip link connects to an ion channel on the side
Term
Sounds that the outer hair cells produce?
Definition
otoacoustic emissons (OEAs)
Term
Describe Otoacoustic Emissions. How do these occur?
Definition
-sound produced by ear
-originates from OHC in the cochlea as they vibrate in response to incoming sounds.
-emerge at outer canal and are measured by very sensitive microphones
Term
noise exposure and the amount of damage depends on what 2 things?
Definition
-duration (time spent)
-amplitude (level of noise)
Term
Cochlear Implant Process (4 steps)
Definition
1. microphone picks up sound and sends to speech processor
2.speech processor digitally encodes sound & sends to trasmitter
3.transmitter sends info across skin to revciever/stimulator
4.reciever/stimulator presents info to auditory nerve in form of tiny electrical pulses
Term
Cochlear implants replace what?
Definition
damaged hair cells
Supporting users have an ad free experience!