Muscle Sensory Receptors

Question 1

How many sensory neurons are found per sense organ?

Answer 1

MS Ia - 1
MS II - 1-5
Gto Ib - 1-2

Question 2

Which cells do the sense organs innervate?

Answer 2

MS Ia - all spindle muscle cells
MS II - only slow contracting spindle muscle cells
Gto Ib - muscle tendon at junction with muscle cells

Question 3

What signals do the sense organs detect?

Answer 3

MS Ia - movement, velocity, and length
MS II - length
Gto Ib - muscle force

Question 4

What is the effect of a gamma dynamic motor neuron on muscle spindles?

Answer 4

Ia - increases sensitivity

II - none

Question 5

What is the effect of a gamma static motor neuron on muscle spindles?

Answer 5

Ia and II - increases sensitivity

Question 6

Do gamma motor neurons have an effect on golgi tendon organs?

Answer 6

no

Question 7

What are the 3 types of muscle sensory receptors?

Answer 7

muscle spindle primary Ia
muscle spindle secondary II
Golgi tendon organ Ib

Question 8

When you rapidly stretch a muscle that is relaxed, what is the effect on the muscle spindle vs. the Golgi tendon organ?

Answer 8

MS - increase discharge

Gto - little or not increase

Question 9

When you try to stretch a contracted muscle, what is the effect on the muscle spindle vs. the Golgi tendon organ?

Answer 9

MS - no discharge

Gto - increase discharge

Question 10

When an isotonic contraction with alpha-gamma co-activation occurs, what is the effect on the muscle spindle vs. the Golgi tendon organ? What does the muscle length do and how does the force change with this kind of contraction?

Answer 10

MS - maintain discharge; Gto - discharge reflects load
decreases
stays constant

Question 11

When an isometric contraction occurs, what is the effect on the muscle spindle vs. the Golgi tendon organ? What does the muscle length do and how does the force change with this kind of contraction?

Answer 11

MS - no discharge; Gto - large increase in discharge
remains constant
force is large (so increase)