Test 3.1

Question 1

What’s the structure of the GTO

Answer 1

• encapsuled fluid filled sheath
• located at the musclotendionus junction
• series relationship to muscle fibers

Question 2

What’s the function of the GTO

Answer 2

• sensitive to small changes in tension due to muscle contraction
• not very sensitive to stretch

Question 3

What are the central connections of GTO

Answer 3

• 1b sensory neuron

- inhibits homoymous muscle/activities antagonist muscle

Question 4

What are the two types of phases of muscle stretch

Answer 4

Dynamic and static

Question 5

What does 1a axon respond best to dynamic or Phasic

Answer 5

Dynamics and static (velocity of stretch )

Question 6

What does 2 axon respond best to dynamic or static phase

Answer 6

Static phase

Question 7

Does 1a or 2 axon respond best to small changes in length

Answer 7

Both

Question 8

Is the response for a 1a axon constant or varied for amplitude and speed

Answer 8

Amplitude : constant

Speed: varied

Question 9

What’s the difference between 1a and 2 sensory axon

Answer 9

1a innervates the nuclear bag dynamic fiber and 2 axon does not

Question 10

Do you lose sensation with a joint replacement

Answer 10

No

Question 11

What are the characteristic of joint receptors

Answer 11

• free nerve ending (lot of them)
• Merkel’s type ending
• type 3 and 4 fibers (very slow)

Question 12

What does GTO sense

Answer 12

Tension and force

Question 13

Are afferent or efferent myelinated

Answer 13

Afferent

Question 14

Which is faster and which is the second fastest 1a or 1b.

Answer 14

1a is the most fastest and 1b is the second fastest

Question 15

What does 1b innervate and what does 1a innervate

Answer 15

1b innervates GTO

1a innervates muscle spindle

Question 16

If collagen fiber is on slack does it get excited? And if it isn’t on excited does it get excited

Answer 16

If it’s on slack it doesn’t get excited and if it is not on slack it does get excited

Question 17

When you push on the dendrites what happens

Answer 17

You let sodium in leading into a excited response

Question 18

What is the inverse stretch reflex

Answer 18

A circuit that shuts off muscle if you get input from 1b

Question 19

Does intrafusal muscle cell give info about muscle cell or generate muscle force

Answer 19

Give info about muscle cell

Question 20

Does extrafusal muscle cells give info of muscle cell or generate muscle force

Answer 20

Generate muscle force

Question 21

Does primary ending fire at high or short frequencies

Answer 21

High frequency

Question 22

Does primary ending fire at high or short frequencies

Answer 22

Short frequencies

Question 23

What does gamma motor neurons maintain

Answer 23

Sensitivity of spindles

Question 24

If you stimulate the static gamma fiber what happens

Answer 24

You end up with a larger static response but no change in dynamic response

Question 25

If you stimulate dynamic response what happens

Answer 25

You get a larger dynamic response but no static response

Question 26

When at rest do you have a dynamic or static response

Answer 26

You have neither

Question 27

What are the two types of muscle receptors and explain them

Answer 27

Golgi tendon organ- specialized region of tendon (collagen fiber)

Muscle Spindle- specialized muscle cell, also parallel arrangement to muscle cell