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Neuro test #4.txt
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What detects low frequency sounds?
Interaural time differences
What detects high frequency sounds?
Interaural intensity differences
What is the K and Na ratios in the
endolymph
and
perilymph
?
Endolymph:
high K, low Na
Perilymph:
high Na, low K
What are the three parts of the cochlear duct?
Scala Media
Scala Vestibuli
Scala Tympani
What is the fluid difference b/t the three parts of the cochlear duct?
Scala Media = Endolymph
Scala Tympani and Vestibuli = Perilymph
What windows must be passed through to enter either the scala vestibuli or scala tympani?
Vestibuli = Oval Window
Tympani = Round Window
What is the name of the bone that makes up the swirly pattern of the cochlea?
Modiolus
vestibular membrane
Tectorial membrane
Spiral ligament
Basilar membrane
Stria Vascularis
What does the Stria Vascularis contain?
Endolymph
What window does the stapes first contact?
Oval Window
What frequencies are based as the base and apex of the basilar membrane and why?
Base:
higher frequencies, thinner
Apex:
lower frequencies, thicker
What creates the material within the tectorial membrane?
Spiral limbus
What forms the
APC (cuticular plate)
above the hair cells of the
organ of corti
?
Dieter's cells
When do stereocilia de-/hypo-polarize?
Depolarize:
when bent towards taller cilia
Hyperpolarize
: when bent towards smaller cilia
What type of fibers synapse on IHCs?
Type 1 Afferents
What type of fibers synapse on OHCs?
Type 2 afferents
What is the difference in frequency range between IHCs and OHCs?
IHC
: Narrow frequency range
OHC
: Wide frequency range, low frequency
What codes for frequency and intensity?
frequency = afferent fiber placement
intensity = AP firing rate
Efferent Cochlear innervation
What do the Lateral Superior Olive (LSO) fibers project to?
What do the Medial Superior Olive (MSO) fibers project to?
LSO
: Type I fibers of IHCs
MSO:
OHCs
What frequencies reach medial and lateral
isofrequency columns
?
Medial:
high frequency
Lateral:
low frequency
** They follow the "base to apex rule" with the base being thinner and the apex thicker
What artery supplies the cochlear nuclei in the medulla?
AICA - specifically the
internal labyrinthine artery
Author
kepling
ID
81073
Card Set
Neuro test #4.txt
Description
Neuro test #4
Updated
2011-04-25T23:46:46Z
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