Mod 12 SC, Muscle Tone And Reflexes

Question 1

The spinal cord extends from the ____ to the ____

Answer 1

Foramen magnum; cons medullaris

Question 2

There are ____ pairs of spinal nerves

Answer 2

31

Question 3

T/F a lesion to a single spinal nerve usually causes a marked functional problem

Answer 3

False; does not

Question 4

The spinal gray matter is an ____ area

Answer 4

Integrative

Question 5

What are the three types of motor neurons in the SC gray matter

Answer 5

1. Alpha motor
2. Gamma motor
3. Pre-ganglionic motor

Question 6

What two fibers do the skeletal muscles consist of

Answer 6

Extrafusal and infrafusal

Question 7

Which motor neuron innervate extrafusal fibers?

Answer 7

Alpha motor neurons

Question 8

T/F: the extrafusal fibers are part of muscle spindles

Answer 8

False; make up mass of skeletal muscles

Question 9

T/F: Gamma motor neurons innervate intrafusal fibers

Answer 9

True

Question 10

Both ____ neurons and _____ neurons innervate skeletal muscles

Answer 10

Alpha motor and gamma motor

Question 11

What are the types of infrafusal fiber

Answer 11

1. Nuclear chain fibers

2. Nuclear bag fibers

Question 12

T/F: muscle spindle is a stretch receptor

Answer 12

True

Question 13

The muscle spindle is a _____ receptor within the muscle

Answer 13

Sensory

Question 14

What does the muscle spindle monitor?

Answer 14

Muscle length and rate of change in the muscle length