Flashcards in Auditory System Deck (41):
What are the 3 fluid-filled cavities of the cochlea?
Where is the Scala media closed off at?
What connects the Scala tympani and the Scala vestibuli?
What is continuous at the Scala tympani and the Scala Vestibuli?
What meets the round window?
What meets at the oval window?
Describe the Basilar Membrane
Vibrates in sync with fluid motion
What determines the distance that a particular frequency travels?
The width and flexibility of the basilar membrane
What opens the TRPA1 channels?
Force towards kinocilium
What connects transduction channels (Cation channels on hairs)
What inputs do inner hair cells receive?
What inputs do outer hair cells receive?
What is the motor protein composed of?
What does Furosemide affect?
Inactivates the membrane motor so reveals its influence
What is endolymphs potential?
What potential is generated to the sterocilia membrane?
Is there higher or lower Potassium levels in the endolymph?
What are the two coding systems for the auditory nerve?
What frequency level does Place code do?
What frequency does Temporal code do?
In the brain, what is the pathway from ear end?
Intermediate acoustic site
Superior olivary nuclei
nucleus of the lateral lemniscus
Medial geniculate nucleus
Primary auditory cortex
What are the 3 branches of the VIII nerve?
Dorsal Cochlear Nucleus (DCN)
Posteroventral Cochlear Nucleus (PVCN)
Anteroventral Cochlear Nucleus (AVCN)
What does tonotopy ensure?
Each neurone innervates several different areas and different neuron types
What do the semicircular canals measure?
Head angular acceleration (head rotation)
What do the saccule and the utricle measure?
Head linear acceleration (Translation motion and Gravity)
What are the saccule and the utricle known as?
The Otolith organs/Otocysts
What does cochlea vibration and labyrinth acceleration/gravity do?
Deforms the hair cells
What does deformation of hair cells do?
Generates an electrochemical signal which is transmitted by nerve fibres to the vestibular nucleus
What does deformation of the stereocilia towards kinocilium cause?
In the semicircular canals, what is the Crista?
Sheet of cells where hair cells are clustered
What does the fluid displace when there is movement?
Where is the Crista?
In the Ampulla
What does the posterior canal share a plane with?
Contralateral anterior canal
What movement does the saccule measure?
What movement does the utricle measure?
In the otolith organs, where do the hair cells lie?
In the macula
what divides the hair cells into two groups?
What are present on the otolith membrane?
Crystals of calcium carbonate called Otocania
What is the Vestibulo-ocular reflex?
Keeps the eyes still in space when the head moves
What is the Vestibulo-colic reflex?
Keeps head still in space on level plane when you walk