McLean Vestibular

function of this system

position and movement of head

balance and equilibrium

what happens when this system is disrupted_

vertigo and vomiting

uncontrollable eye movements

bone in inner ear

labyrinth

otolith organs

utricle and saccule

function of otolith organs

linear acceleration of head

cell bodies of 8th nerve where

scarpas ganglion

semicircular canals

sensitive to head rotation

how do bodies move

6 degrees

3 transitional and 3 rotational

tallest stereocilia

kinocilium

endolymph

high K and low Na

where are vestibular hair cells in the utricle and saccule are a swelling called

called ampullae

what is the macula

houses sensory epithelium

hair bundles

gelatinous layer covered by otoconia

what happens when the head tilts

causes otolithic membrane to shift relative to sensory epithelium.

what does the otolithic membrane

heavier than fluid

causes a lag behind sensory epithelium

static tilt

sustained

changes head tilt

accelerations

transient '

striola

opposite sides equal opposite polarities

cupula

gelatinous mass that hair bundles extend into

what can not flow through cupula_

endolymph

vestibulo’ocular reflex

Head rotation activates semicircular canals in inner ear and drives compensatory eye movements to __***stabilize image*** __of visual world on the retina



gaze stays the same

optokinetic nystagmus

track motion and eyes movements snap back