Auditory Vestibular system Flashcards
What are cilia responsible for?
Stimulus-responsive cation entry
How does the tilting of hair cells (cilia) effect the amount of glutamate released by the cell body?
The larger the degree of tilting the more glutamate is released and the more AP’s are generated
Name the otolith organs
- Saccule
- Utricle
What membrane do the cochlear hair cells sit on?
Basilar membrane
What membrane lies above the cochlear hair cells?
Tectorial membrane
What is the K+ current in the hair cells?
The scala media is filled with endolymph which is very high in K+ so therefore the K+ current is inwards to the hair cell
Where are low frequency transduced into electrical signal on the basilar membrane?
At the start
Where are high frequency transduced into electrical signal on the basilar membrane?
At the end
What are inner hair cells responsible for?
Main source of afferent signal to auditory nerve CN8
What are outer hair cells responsible for?
Receive efferent input to control stiffness & amplify membrane vibration
What side of the brain is each ears respective auditory cortex?
contralateral side
What do the semicircular canals do?
Detect head movement via rotatory acceleration
What is the ampulla of the semicircular canal?
A bulge that contains the crista
What is the crista of the semicircular canal?
Sheet of cells where hair cells are clustered
What is the saccule responsible for?
Detecting movement in the vertical/sagittal plane
