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?
What does the Stria Vascularis contain?
What window does the stapes first contact?
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?
What forms the APC (cuticular plate) above the hair cells of the organ of corti?
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
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