The document provides detailed information on the anatomy and physiology of the vestibular system, including its components such as the cochlea, semicircular canals, and receptors. It describes key functions like equilibrium maintenance and sensory processing, along with physical tests like the caloric test, dizziness handicap inventory, and head impulse test used to assess vestibular function. Each test's methodology and purpose are outlined, highlighting their relevance in diagnosing vestibular disorders.

1. VESTIBULAR
EXAMINATION
BY:
DR. APOORVA SRIVASTAVA (PT)
MPT (NEURO)

2. ANATOMY
 Encased in bony tubules called bony labyrinth.
 Chambers within bony labyrinth forming functional
part called membranous labyrinth.
 Consists of 2 parts:
1. Cochlea
2. 3 semicircular canals
3. 2 chambers utricle and saccule.
 Cochlea supplied by cochlear nerve.
 Utricle and saccule are sensitive to orientation of
head to gravity and motion.
 Utricle and saccule have 2 types of receptors:
1. Peripheral vestibular receptors
2. Central vestibular receptors
 Important factor is endolymph.

4. PHYSIOLOGY
 Cristae- receptors for semicircular canals.
 Saccule- movement of head in vertical plane.
 Semicircular canals- rotational movement in 3
planes.
 Movement of endolymph detected by hair cells.
 Cristae – kinetic balance receptors.
 Maculae- static balance receptors.
 Impulses travel with respect to stereocilia and
kinocilium.
 Connected to :
1. Eye muscles
2. Spinal cord
3. Autonomic centers
4. Cerebral cortex

6. FUNCTIONS
 Sensory processing of head motion.
 Coordination of visual and postural
movements.
 Maintainence of equillibrium.
 Modulation of self , body and self awareness.
 Integration of various movements and
balance related parameters.
 Adaptation to specific locomotor patterns.
 Perception accuracy.
 Stabilization of visual field.
 Presence of Static and dynamic balance
receptors.

8. PHYSICAL TESTS
 Caloric test
 Dizziness handicap inventory
 Head impulse test
 Head shaking induced
nystagmus test
 Dix- hallpike test
 Dynamic visual acuity test
 Rotational chair test
 Romberg test

9. Caloric test
 Test for vestibulo-occular reflex.
 Tests the lateral semicircular canal alone
 Uses hot water and cold water simultaneously.
 Water irrigated into external auditory canal.
 Warm water at 44degrees mimics head turn to
ipsilateral side.
 Cold water at 30 degrees or below mimics
head turn to contraleteral side.
 Dysfunction- absent reactive eye movement.

10. DIZZINESS HANDICAP
INVENTORY
 A questionnaire with 25
questions subgrouped under
functional, emotional and
physical components.
 Excellent test retest reliability.
 Quantification of patient’s
perception and dysequillibrium.
 Self reported measures.

11. HEAD IMPULSE TEST
 To examine semicircular canal function.
 Cervical range should be known.
 Patient should fixate on a target.
 Head flexed at 30 degrees.
 Small amplitude, moderate velocity and
high acceleration angular impulse is given
in an unpredictable direction.
 Corrective sequade to reposition eyes on
target.

12. HEAD SHAKING INDUCED
NYSTAGMUS TEST
 Useful in diagnosis of unilateral
peripheral vestibular defect.
 Eyes of patient are closed.
 Head flexion is 30 degrees.
 Horizontal oscillation for 20 cycles
at frequency of 2 reps/second.
 Nystagmus to be checked on eye
opening.
 Seen in patients with acoustic
neuroma.

13. DIX- HALLPIKE TEST
 Commonly used to identify BPPV
benign paroxysmal positional vertigo.
 Otoconia get displaced into
semicircular canal.
 Starting from long sitting position.
 Head rotated 45 degrees to one side.
 Supine with head extended beyond
horizontal 30 degrees.
 Direction of nystagmus is unique to
involved semicircular canal.

14. DYNAMIC VISUAL ACUITY TEST
 Measurement of visual acuity during
horizontal movement of the head.
 Static visual acuity determined first.
 Identified with smooth persuit eye
movement.
 Patient asked to read a lighthouse
EIDRS( Early treatment diabetic
retinopathy study) .
 Horizontal rotation of head at a
frequency of 2 Hz.

15. ROTATIONAL CHAIR TEST
 Measures dizziness while being
turned slowly in a motorized
chair.
 Patients with inner ear disease
becomes less dizzy.
 Optokinetic test measures
dizziness by viewing of moving
stripes.
 Diagnosis of bilateral vestibular
loss.

16. ROMBERG TEST
 Patient stands with feet close
together and arms open by side with
first eyes open and then eyes
closed.
 Eyes staring at an object for 3
minutes.
 Then eyes closed and sway is seen.
 Maximum sway is measured.
 Sharpened romberg test includes
standing with one toe forward of the
other and hands folded at the chest
level.