The Vestibular System Flashcards
What are the three semi circular canals in the vestibular system
anterior vertical, posterior vertical, horizontal
What is located in the ampulla
sensory cells
What are the semi-circular canals filled with
endolymph
What detects linear motion
otolith organs
What detects rotational movement
semi circular canals
What does the saccule detect
movement in the vertical plane
What innervates the ampulla, saccule and utricle
vestibular nerve - 8
TRUE or FALSE - hair cells have a nucleus
True
What potentials do hair cells of the vestibular system develop
graded potentials
Describe the effect of decreased impulse frequency on hair cells
hyper polarisation
What do cochlear inner hair cells lose as they mature
kinocillium
What hair cells kept their kinocillium throughout their life
saccular hair cells
Which type of vestibular hair cells are similar to inner hair cells
type 2
Which type of vestibular hair cells has calyx
type 1
What do the saccule and utricle detect
head tilt and linear acceleration
What stimulates the saccule and utricle
otolithic membrane
What is the otolithic membrane
gelatinous structure
Where does the otolithic membrane sit
top of hair cells
What are otoconia
calcium carbonate crystals
What does the otoconia sit on
otolithic membrane
What is the function of the otolithic membrane
add weight
What is information from saccule and utricle integrated with
proprioreceptors
What is the cupula
jelly like structure
what surrounds the cupula
endolymph
True or false - hair cells stick up into the ampulla
true
What displaces the cupula
inertia of endolymph
Where do potentials from the vestibular organs travel to
cerebellum or vestibular nuclei
Why do some potentials go straight to the cerebellum
speed - prevent falling over
Why is the vestibular system faster than the visual system
uses ion channels
What causes menieres disease
excessive endolymph
What are the symptoms of menieres disease
intermittent vertigo, tinnitus
What are the vestibular hair cells
mechanoreceptors
What is the function of the vestibular nystagmus
reset eye position during head rotation
