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Vestibular Reflexes
Balance Assessment
10
Audiology
Graduate
03/07/2018

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Cards

Term
innervation characteristics for type I and type 2 hair cells:
-Type 1: One ___ nerve ending can synapse with one, or two to four hair cells
-Type 2: Multiple efferent and afferent ___ nerve synapses
Definition
calyx; bouton
Term
Ewald's Law:
-EL 1: Stimulation of a semicircular canal (SCC) causes eye ___ with respect to head in the plane of the canal stimulated
-EL 2: In the horizontal canals, movement of endolymph _____ utricle causes greater neural activity than does movement of the endolymph _______ utricle
Definition
rotation; toward; away from
Term
Ewald's Law:
-EL 3: In vertical canals, movement of endolymph _______ utricle causes greater neural activity than ________ movement of the endolymph
Definition
away from; utriculopetal
Term
The primary purpose of this reflex is to elicit rapid compensatory eye movements that maintain stability of image on fovea during head movement. Moves eyes in direction opposite to head rotation.
Definition
Vestibulo-Ocular Reflex (VOR)
Term
The purpose of this reflex is to maintain posture and maintain a center of mass over base of support. There is an upper and lower limb response: Ipsilateral (to direction of acceleration) muscles are extended and contralateral muscles are contracted
Definition
Vestibulospinal Reflex (VSR)
Term
This reflex assists in maintaining the head in a horizontal gaze orientation relative to gravity. Mediated through the utricle and saccule.
Definition
Vestibulocolic Reflex (VCR)
Term
What are five central areas which receive afferent information from vestibular nuclei?
Definition
Extraocular motor nucle, Spinal cord, Flocculus of the cerebellum, reticular formation, and the thalamus
Term
Indicate the location of the vestibular cortex
Definition
the area between the parietal and insular lobes
Term

Connections with vestibular cortex, thalamus, and

reticular formation allow:

-Integrations of arousal and conscious awareness of the

body to discriminate between movement of ___ and ___

 

 

 

Definition
self; environment
Term

Cerebellar connections help maintain: 

-___ of VOR

› -Contribute to ___ during static and dynamic activities ›

-Influence ___ of limb movements

 

Definition
Calibration; posture; coordination
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