Ear Physiology Flashcards
(45 cards)
What is the bony labyrinth?
A system of torturous channels worming though the bone
What fluids are filled in the labyrinth?
Perilymph and endolymph
What is endolymph fluid?
Potassium rich intracellular fluid
What is perilymph fluid?
Similar to CSF and continuous with it
What does the saccule and utricle vestibules do?
House equilibrium receptor regions (maculae)
What are the 3 semicircular canals?
Anterior, posterior and lateral
What does maculae do?
Responds to the pull of gravity and report on changes of head position
What do the semicircular canals do?
Holds the semicircular ducts
Help you keep your balance
The semicircular canals have….
ampulla
What does the ampulla do?
Houses an equilibrium: rotational movements of the head
What are 4 layers part of the cochlea?
Scala vestibuli, scala media, scali tympani and basilar membrane
The scala vestilbuli is part of what and contains what?
Part of the bony labyrinth, contains perilymph
The scala media is part of what and contains what?
Part of the membranous labyrinth and contains endolymph
The scala tympani is part of what and contains what?
Part of the bony labyrinth and contains perilymph
What does the basilar membrane do?
Sound reception, near the oval window, gradually widens and thins as it approaches the cochlear apex
What is frequency?
It is perceived as pitch (peak to peak graph)
What is pitch?
Hertz (different sound frequencies)
How many Hz can we hear?
20 to 20,000
What Hz do we hear best?
1,500 to 4,000
What is amplitute?
The height of the wave of the wavelength graph (its intensity)
10 dB (decibels) has ___ more times energy then ___ dB
10, 0
20 dB is _____ as loud as ____
twice, zero
20 dB has ___ times more energy than 0 dB (10 x10)
100
What is the 1st place people can hear?
0 dB
