1b Motor 1&2 Myotactic Reflex

Question 1

What is the Myotactic Reflex?

Answer 1

stretch of muscle –> stretch of muscle spindle –> reflex response

Question 2

How are extrafusal muscle fibers in line with intrafusal spindle organ fibers?

Answer 2

they are parallel, so if muscle contracts, they contract - if muscle stretches, they stretch

Question 3

What type of afferent fiber is attached to the muscle spindle organ?

Answer 3

1a (fastest)

Question 4

What does the afferent fiber of the muscle spindle organ keep track of?

Answer 4

muscle length & dynamics

Question 5

Where does the efferent portion of myotactic reflex occur, relative to the muscle that sent the afferent signal?

Answer 5

In the same muscle that sent the afferent signal

Question 6

How does the myotactic reflex effect a group of muscles?

Answer 6

synergistic muscles are excited, antagonistic muscles are inhibited

Question 7

What does the Renshaw Cell do?

Answer 7

lateral inhibition of inhibitor (prevents inhibiting neuron from releasing its neurotransmitter)