Chapter 55 Cortical and Brain Stem Control of Motor Function

Chapter 55  Cortical and Brain Stem Control of Motor Function

Complete Chapter Questions And Answers
 

Sample Questions

1. Fine motor movement of the index finger can be elicited by stimulation of which of the following brain areas?
A. The primary motor cortex
B. The lateral cerebellar hemisphere
C. The premotor cortex
D. The supplemental motor area

ANS: A

2. Decerebrate rigidity caused by simultaneous contraction of both the agonist and antagonist muscles in a limb can be alleviated by which of the following maneuvers?
A. Turning the head sharply toward the limb
B. Bending the head forward
C. Stimulating the pontine reticular formation by lightly stroking the palms of the hand
D. Cutting the dorsal roots associated with the affected limb

ANS: D

3. The stretch reflex is used clinically to:
A. Assess the integrity of the corticospinal tract
B. Assess the function of the vestibulo-occular reflex
C. Assess the level of activity of the gamma motor system
D. Assess the function of the vestibular system

ANS: C

4. In the right horizontal semicircular canal, rapid rotation of the head in the clockwise direction will cause the endolymph to move in which relative direction?
A. In a clockwise direction
B. In a counterclockwise direction
C. In an upward direction
D. In a downward direction

ANS: B

5. Which of the following is paired correctly?
A. Gamma motor neuron – extrafusal muscle fiber
B. Alpha motor neuron – intrafusal muscle fiber
C. Betz cells – corticospinal tract
D. Utricle – angular acceleration detection

ANS: C