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VESTIBULAR SYSTEM
I. MULTIPLE CHOICE: Circle all correct answers. There may be more than one
answer per question.
1. The lateral vestibulospinal tract originates in the
A.
B.
C.
D.
E.
Vestibular ganglion
Inferior vestibular nucleus
Superior vestibular nucleus
Lateral vestibular nucleus
Medial vestibular nucleus
2. Fibers of the medial longitudinal fasciculus reaching the spinal cord (a.k.a. the medial
vestibulospinal tract)
A.
B.
C.
D.
E.
Course in the lateral funiculus
Course in the anterior funiculus
Synapse primarily at cervical levels
Originate in the vestibular nuclei
Are primarily concerned with control of leg muscles
3. Structures whose primary function is the detection of linear acceleration of the head
include
A.
B.
C.
D.
E.
sense organs in the temporal bone
the sacculus
the horizontal semicircular canal
the utriculus
the middle ear
4. Otoliths (calcium carbonate crystals) are found in the
A.
B.
C.
D.
E.
saccule
semicircular canals
cochlea
utricle
vestibular hair cells
5. Your kid sister spins herself around and around in Daddy's Naugahyde® swivel chair.
Then she stands up and promptly falls on her face. The sensory receptors (i.e.,
transducing elements) responsible for producing her disequilibrium lie in
A.
B.
C.
D.
E.
the utricles
the semicircular canals
the saccules
Scarpa's ganglion
the vestibular nuclei
6. Turning the head quickly to the right can elicit
A.
B.
C.
D.
E.
excitation of the semicircular canals
excitation of the left sixth nerve nucleus
the vestibulo-ocular reflex
contraction of the medial rectus muscle of the right eye
neural impulses in the medial longitudinal fasciculus
II. TRUE or FALSE. Circle the correct letter.
T F 1. Rotation of the head on the neck always affects only hair cells in a single
semicircular canal.
T F 2. Nystagmus resulting from vestibular stimulation normally affects both eyes.
T F 3. The adequate stimulus for excitation of utricular hair cells is bending of their
cilia.
T F 4. Cell bodies of neurons innervating a semicircular canal are found in Scarpa's
ganglion.
T F 5. The otolith organs are insensitive to linear acceleration of the head.
T F 6. Tilting the head excites hair cells of the otolith organs.
T F 7. The vestibular nuclei can be found in the upper medulla.
T F 8. The otolith organs are most sensitive to angular acceleration of the head.
T F 9. The medial longitudinal fasciculus extends from the midbrain to the spinal
cord.
T F 10. The fiber bundle functionally interconnecting the vestibular system with the
extraocular muscles is the medial longitudinal fasciculus.
T F 11. The vestibular nuclei and cochlear nuclei both lie medial to the sulcus limitans
in the medulla.
VESTIBULAR
I. Multiple Choice
1.
2.
3.
4.
5.
6.
D
B, C, D
A, B, D
A, D
B
A, B, C, D, E
II. True or False
1.
2.
3.
4.
5.
F
T
T
T
F
6. T
7. T
8. F
9. T
10. T
11. F