Review 2

Question 1

Secondary (II) sensory afferents innervate what type of intrafusal fibers?

Answer 1

Secondary sensory ending are seen in all BUT dynamic bag fibers.

Question 2

Primary sensory endings are sensitive to changes in what?

Answer 2

sensitive to length and velocity

Question 3

Secondary sensory endings are sensitive to changes in what?

Answer 3

secondary sensory endings are sensitive to only length

Question 4

What type of neuron can adjust the sensitivity of the intrafusal fibers?

Answer 4

gamma motoneurons

Question 5

What is the function of the golgi tendon organ

Answer 5

muscle force and tension

Question 6

what is the function of muscle spindles

Answer 6

detects changes in muscle length and velocity

Question 7

What is a motor unit?

Answer 7

an alpha motoneuron and muscle fibers it innervates

Question 8

Characterisitcs of Surface EMG

Answer 8

• averages the activity of all (MUs)
• causes no discomfort
• is not selective

Question 9

Characteristics of Intrafusal EMG

Answer 9

• records the activity of individual MUs
• is uncomfortable
• provides information about excitation of a small volume within a muscle

Question 10

Primary (Ia) sensory afferents innervate what type of intrafusal fibers?

Answer 10

Primary endings are typically seen in virtually ALL intrafusal fibers