Exam IV-Vestibular

Question 1

Where do the semicircular canals terminate?

Answer 1

the utricle (after the ampulla of coarse)

Question 2

Is the horizontal canal usually next to the anterior or posterior canal?

Answer 2

Posterior

Question 3

Where are the vestibular hair cells?

Answer 3

The AMPULLA

Question 4

What is the gelatinous mass surrounding the vestibular hair cells?

Answer 4

The CUPula

Question 5

Is the cell depolarized or hyperpolerized when the stereocillia move TOWARD the kinocillia?

Answer 5

TO the Kinocillia = DEpolarization

Question 6

What are the utricle and saccule?

Answer 6

Otolith organs

Question 7

Fxn of utricle?

Answer 7

Forward and backward acceleration

Question 8

Fxn of saccule?

Answer 8

VERTICLE displacements

Question 9

Which plane is the macula of the utricle in?

Answer 9

Horizontal plane

Question 10

Which plane is the macula of the saccule in?

Answer 10

vertical plane

Question 11

What is the main tract for the SVN pathway? Where does it go?

Answer 11

CEREBELLUM…MLF!

Question 12

What is the main tract for the LVN? Where does it go?

Answer 12

CORTEX…vestibulospinal tract…to the cotex for perception of balance

Question 13

What is the main tract for the MVN? Where does it go?

Answer 13

EYE…coordinates eye movement. uses MLF & vestibulospinal tracts

Question 14

What is the tract, function, and destination of IVN?

Answer 14

CEREBELLUM & RETICULAR formation…postural control uses contra vestibular nuclei

Question 15

What causes BPPV?

Answer 15

CupoloLithasis and Canalithasis

Question 16

Which disease is an over production or lack of absorption of endolymph?

Answer 16

Meniere’ Disease both auditory and vestibular!!

Question 17

When turning the head to the left, which eye muscles and CNs are stimulated to keep eyes forward?

Answer 17

The L eye’s medial rectus and there for CN III. The R eye’s Lateral Rectus and therefore CN VI.