Chapter 54 Motor Functions of the Spinal Cord; The Cord Reflexes

Chapter 54  Motor Functions of the Spinal Cord; The Cord Reflexes

Complete Chapter Questions And Answers
 

Sample Questions

1. In a muscle spindle receptor, which fiber is responsible for the dynamic response?
A. The extrafusal muscle fiber
B. The static nuclear bag fiber
C. The nuclear chain fiber
D. The dynamic nuclear bag fiber

ANS: D

2. Type II sensory afferents from the muscle spindle receptor are attached to which of the following structures?
A. The extrafusal muscle fiber
B. The dynamic nuclear bag fiber
C. The nuclear chain fiber
D. The gamma S fiber

ANS: C

3. Which of the following will increase the sensitivity of the stretch reflex?
A. Cutting the dorsal root fibers associated with the muscle in which the stretch reflex is being examined
B. Increasing the activity of the medullary reticular nuclei
C. Bending the head forward
D. Increased activity in the fusimotor (gamma motor neuron) system

ANS: D

4. Activation of a type 1b sensory neuron will have which of the following effects?
A. Contraction of the muscle fiber associated with this neuron
B. An initiation of a complex spike output signal
C. Central nystagmus
D. Inhibition of muscle contraction in the muscle fiber associated with this neuron

ANS: A

5. Assuming all sensory, motor, and reflex neuronal pathways are intact, skeletal muscle contraction can be caused by stimulation of which of the following?
A. Type 1a sensory nerve endings
B. Type 1b sensory nerve endings
C. Neurons in the ventromedial hypothalamus
D. Preganglionic parasympathetic vagal nerves

ANS: A