Inner Ear Flashcards
Movement of the stereocilia of the IHC results in a flow of ____ ions into the stereocilia, that originate within the_____ fluid.
POTASSIUM, ENDOLYMPH
OHC motility causes an increase in the intensity of sound at the cochlea, therefore OHCs act as a ________ _________
COCHLEAR AMPLIFIER
If you’re in a an airplane that is taking off and the air pressure in the cabin drops, what happens to your eardrum?
POSITIVE PRESSURE, TM PUSHES OUTWARD
Name the two main purposes of the inner ear system.
TRANSDUCE MECHANICAL TO ELECTROCHEMICAL, BALANCE SYSTEM
Can you slice open the skill and take out the inner ear system as one piece? Why or why not?
NO. PETROUS PORTION OF TEMPORAL BONE IS A SPACE.
What two major cranial nerves does the internal auditory canal carry?
ACOUSTIC AND FACIAL
What membrane separates the scala vestibuli from the scala media?
REISSNER’S MEMBRANE
Name the three fluids in the inner ear?
ENDOLYMPH, PERILYMPH, CORTILYMPH
WHich fluid is high in Potassium (K+) and low in Sodium (Na+)?
ENDOLYMPH
The spiral lamina is _____ at the base and ______ at the apex.
WIDE, NARROW
Which type of hair cell in the cochlea is surrounded from the base to apex by supportive cells?
INNER HAIR CELLS
This type of supportive cell forms the substance of the tectorial membrane:
BORDER CELLS OF HELD
What are the two functions of the phalangeal process?
FORM RETICULAR LAMINAE, SUPPORT HAIR CELLS
In the cochlea there are ____ rows of IHCs, and _____ rows of OHCs.
ONE, THREE
The utricle and saccule are responsible for interpreting _____ acceleration.
LINEAR
The bodys ability to maintain balance depends on information from three body systems. What are they?
VISUAL, SOMATOSENSORY, VESTIBULAR
When the head turns right, the fluid in the horizontal semicircular canal lags behind the movement of the head due to:
INERTIA
Narrow ducts projecting from the utricle and saccule join together to form the______
ENDOLYMPHATIC
Tones of low frequency with longer wavelengths show maximum displacement of the basilar membrane near the _____ end of the cochlea.
APEX
T or F: Low frequency sounds activate the high frequency end of the basilar membrane, in addition to their frequency specific points.
TRUE
The OHC motility that results in the increase in the IHC response is called the______
COCHLEAER AMPLIFIER
The responsiveness of auditory neurons to sounds at specific frequencies and not for sounds at other frequencies is called:______
FREQUENCY SELECTIVITY
A collection of nerve fibers that enter the modiolus on their way to the IAC are called:___
SPIRAL GANGLIA
The inner ear contains two labyrinth systems, what are they called?
OSSEOUS, MEMBRANOUS
How many turns does the cochlea make from its base to its apex?
2 3/4
The bony shelf that projects from the modiolus is called?
SPIRAL LAMINA
What membrane separates the scala tympani from the scala media?
BASILAR MEMBRANE
Where are the three fluids of the inner ear located?
ENDOLYMPH: INSIDE MEMBRANOUS LABYRINTH
PERILYMPH: BETWEEN BONY AND MEMBRANOUS
CORTILYMPH: INSIDE ORGAN OF CORTI
T/F the fluids in the middle ear are compressible?
FALSE
The basilar membrane is thinnest and stiffest where?
BASE
The cochlea is the thickest and most flaccid where?
APEX
If you slice a cochlea in half, it will have three channels. What are their names?
SCALA VESTIBULI
SCALA MEDIA
SCALA TYMPANI
The stereocilia of the hair cells in the cochlea are attached to the hair cells at the?
CUTICULAR PLATE
Each macula consists of a gelatinous membrane called?
OTOLITHIC MEMBRANE
Outer hair cell motility improves our hearing sensitivity by about ( ) to ( )dB, and contributes to our ability to precisely distinguish among specific ( ).
40,
50,
FREQUENCIES
Each ampulla contain a sensory organ called the ______
CRISTA
When coding the frequency of sound, both place and temporal coding mainly occur is between what frequencies.
1000-5000 HZ
Each Crista consists of a gelatinous mass called the ___________.
CUPULA
