CVT Vestibular System Anatomy & Physiology Techniques 5

Question 1

The cervico-ocular reflex (COR) contributes to gaze stabilization during:

Accepted Answer

Slow, low-frequency head movements in patients with bilateral vestibular loss

Answer

The COR, driven by neck proprioceptors, contributes most at low frequencies and plays a compensatory role in patients with bilateral vestibular hypofunction when the VOR is absent.

Question 2

The crista ampullaris within each semicircular canal is embedded in a gelatinous structure called the:

Accepted Answer

Cupula

Answer

The cupula is the gelatinous flap that spans the ampulla and moves in response to endolymph flow, deflecting the hair cell stereocilia of the crista ampullaris.

Question 3

Ewald's Second Law states that in the horizontal canal, ampullopetal flow causes a response that is:

Accepted Answer

Stronger than the response to ampullofugal flow

Answer

Ewald's Second Law states that ampullopetal flow (excitation) in the horizontal canal evokes a stronger response than ampullofugal flow (inhibition), reflecting asymmetric canal dynamics.

Question 4

The ocular tilt reaction (OTR) seen with a unilateral otolith or vestibular nucleus lesion includes which combination of signs?

Accepted Answer

Ipsilesional head tilt, skew deviation, and ocular counter-rolling toward the lesion

Answer

A unilateral peripheral OTR includes ipsilesional head tilt, skew deviation (lower eye ipsilesional), and ocular counter-rolling with the top pole of the eyes rotating toward the lesion.

Question 5

The subjective visual vertical (SVV) test measures a patient's ability to align a rod with true vertical, and peripheral vestibular lesions typically cause the perceived vertical to be:

Accepted Answer

Tilted ipsilesionally (toward the lesion side)

Answer

After a unilateral peripheral vestibular lesion, the SVV tilts toward the affected (ipsilesional) side because loss of utricular input creates an asymmetric gravity signal.

(CVT) Certified Vestibular Therapist Practice Test

(CVT) Certified Vestibular Therapist Practice Test

CVT Vestibular System Anatomy & Physiology Techniques 5