Test 3.1 Flashcards
What’s the structure of the GTO
- encapsuled fluid filled sheath
- located at the musclotendionus junction
- series relationship to muscle fibers
What’s the function of the GTO
- sensitive to small changes in tension due to muscle contraction
- not very sensitive to stretch
What are the central connections of GTO
- 1b sensory neuron
- inhibits homoymous muscle/activities antagonist muscle
What are the two types of phases of muscle stretch
Dynamic and static
What does 1a axon respond best to dynamic or Phasic
Dynamics and static (velocity of stretch )
What does 2 axon respond best to dynamic or static phase
Static phase
Does 1a or 2 axon respond best to small changes in length
Both
Is the response for a 1a axon constant or varied for amplitude and speed
Amplitude : constant
Speed: varied
What’s the difference between 1a and 2 sensory axon
1a innervates the nuclear bag dynamic fiber and 2 axon does not
Do you lose sensation with a joint replacement
No
What are the characteristic of joint receptors
- free nerve ending (lot of them)
- Merkel’s type ending
- type 3 and 4 fibers (very slow)
What does GTO sense
Tension and force
Are afferent or efferent myelinated
Afferent
Which is faster and which is the second fastest 1a or 1b.
1a is the most fastest and 1b is the second fastest
What does 1b innervate and what does 1a innervate
1b innervates GTO
1a innervates muscle spindle
If collagen fiber is on slack does it get excited? And if it isn’t on excited does it get excited
If it’s on slack it doesn’t get excited and if it is not on slack it does get excited
When you push on the dendrites what happens
You let sodium in leading into a excited response
What is the inverse stretch reflex
A circuit that shuts off muscle if you get input from 1b
Does intrafusal muscle cell give info about muscle cell or generate muscle force
Give info about muscle cell
Does extrafusal muscle cells give info of muscle cell or generate muscle force
Generate muscle force
Does primary ending fire at high or short frequencies
High frequency
Does primary ending fire at high or short frequencies
Short frequencies
What does gamma motor neurons maintain
Sensitivity of spindles
If you stimulate the static gamma fiber what happens
You end up with a larger static response but no change in dynamic response
If you stimulate dynamic response what happens
You get a larger dynamic response but no static response
When at rest do you have a dynamic or static response
You have neither
What are the two types of muscle receptors and explain them
Golgi tendon organ- specialized region of tendon (collagen fiber)
Muscle Spindle- specialized muscle cell, also parallel arrangement to muscle cell
