Midterm Vestibular System Flashcards
Name the 3 important functions of the Vestibuar system
- To porvide subjective senssation of movement and/or displacement in 3 dimentional space
- To Maintain upright body posture (balance)
- To stabilize the eyes during head/body movement
Name the three Vestibular Reflexes
VOR - a reflex that stabilizes your vision
VCR -
VSR -
Name the Vestibular Reflexes
VOR - Reflexive eye movement to enable clear vision during head movement.
VCR - a reflex that helps stabilize the head to keep the head in horizontal gaze position.
VSR -compensatory body movements to maintain head and postural stability in upper and lower limbs;
What does VOR stand for?
Vestibulo-ocular Reflex
VOR
What does VCR stand for
Vestibulo-collic Reflex
VCR
What does VSR Stand for?
Vestibulospinal Reflex
VOR (vestibulo-ocular reflex) =
VCR (Vestibulo-Collic Reflex) =
VSR (Vestibulo-Spinal Reflex) =
- VOR (vestibulo-ocular reflex) = Stabilizes Vision (coordinating eye w/head movement)
- VCR (Vestibulo-Collic Reflex) = Head stabilization (via neck muscles)
- VSR (Vestibulo-Spinal Reflex) = Whole-body balance (via spinal/postural muscles)
What does VOR do?
VOR - Generates reflexive eye movement to enable clear vision during head movement.
- Stabilizes Vision
What does VCR do
VCR: a reflex that helps stabilize the head to keep the head in horizontal gaze position.
- Head stabilization
What does VSR do?
VSR - compensatory body movements to maintain head and postural stability in upper and lower limbs.
- Whole-body balance/stability
The VOR generates reflexive eye movements that are ____ to but _____ of ______
THe VOR generate reflexive eye movements that are equal to but opposite of head movement
True or false
The CNS will cause eyes to rapidly move back to center to establish new focal point via saccade
True
VOR - system
Explain the limited range of eye deflection in VOR
- eyes can only move so far
- if teh body continues to roates eyes will eventually reach a limit
- CNS will cause eyes to rapidly move back to center to establish new focal point via saccade
Vestibular system detects movement and postural sway & corrective signals sent to muscles maintain balance & coordinate movement.
VSR
Vestibular system’s conncetion to stablization muscles of cervical spine
VCR
Connection between vestibular system & stability muscles of the torso & lower extremities
VSR
- Helps maintain upright head position
- Independent trunk movement
- Mediated though otolithic organs & medial vestibulospinal tract
VCR
what do these tests assess
VNG (caloric), Rotational Tests (rotary chair), head thrust or vHIT
VOR
What tests are used to asses VOR?
VNG (caloric), Rotational Tests (rotary chair), head thrust or vHIT
What tests are used to asses VSR?
SOT (CDP) or other postural stability exam
What tests are used to asses VCR?
VEMP
what do these tests assess
VEMP
VCR
what do these tests assess
SOT (CDP) or other postural stability exam
VSR
How are the hair cells oriented in the urticle?
Hair cells are oriented toward the striola in the urticle
How are the hair cells oriented in the Saccule?
Hair cells are oriented away from the striola in the saccule
sAccule - A, Away
Stimulation towards kinocilium =
Stimulation towards kinocilium = cell depolarization & increased nerve activity
Stimulation away from kinocilium =
Stimulation away from kinocilium = hyperpolarization & decrased activty in vestibualr nerve
what is part of the superior CN8 divison
Urticle,anterior part of saccule, horizontal canal & anterior canal
what is part of the inferior CN8 divison
Posterior part of saccule & posterior canal
