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Auditory and Vestibular Systems
Terms in this set (20)
Which of the following is NOT a function of the Vestibular system?
A)Monitors the position and movement of the head
B)Gives us our sense of balance and equilibrium
C) Makes your eyes wander when you are sick
D)Helps coordinate movements of the head and eyes
E)Coordinates adjustments to body posture
Where is the structure responsible for the vestibular system located?
In the Vestibular labyrinth within bony labarinth of inner ear
senstitive to head rotation
senstitive to linear accelertation of the head
Which axes do the otolithic organs detect movement along?
linear acceleration along 3 planes and head tilt relative to the force of gravity
Where are hir cells located within the utricle and saccule?
Within the sensory epithelium called the maccula, and the hair cells are surrounded by supporting cells
Where are hair cells located in the semicircular canals?
Within structures called the ampullae at the base of the semicircular canals
Sensory epithelium in the otolithic organs
What is the function of otoconia?
The otoconia are calcium carbonnate crystals which sit atop the gelatenous membrane of the otoliths and make the otolithic membrane heavier than the fluids around it
What is the orientation of the macula in the saccule?
What is the orientation of the macula in the utricle?
During static head tilt, the hair cell response is (sustained or transient)?
During linear accelerations, hair cell response is (sustained or transient)?
Would a tilt of the head induce a sustained or transient response of the vestibular nerve axon of the otolith organs?
Would linear acceleration induce a sustained or transient response of the vestibular nerve axon of the otolith organs?
What is the sensory epithelium of the semicircular canals called?
Describe the vestibular pathway
8th Nerve Affernt --> vestibular nucleus of the brain stem --> cerebellum --> thalamus --> extraocular motor neurons (gaze) or neck motor neurons
What is the Vestibulo-ocular reflex?
The process through which head rotation activates hair cells in the semicircular canals and drives compensatory movement of eyes to stabilize image of visual world on the retina
At what point during the vestibulo-ocular reflex does the information from one ear begin to travel bilaterally?
After it reaches the abducens nucleus in the brainstem
When the eyes snap back in the opposite direction that they turned duing the slow phase of VOR in order to continue to respond to the VOR (bc the eyes can only move so far tot he right or left but if you are spinning in a chair they must return to a normal position every so often in order to continue to adjust as yur head moves)
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