Movement 1 Flashcards Preview

Sensory and Motor Neuroscience > Movement 1 > Flashcards

Flashcards in Movement 1 Deck (9)
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1
Q

What is feedback control in the muscle?

A

where the intended and actual states are compared and an error signal is sent to make a correction

2
Q

What does gain refer to and what can it result in?

A

it refers to the magnitude of the correction made in response to an error signal. high gain can result in instability if the feedback arrives after a significant delay

3
Q

where do motor neurons leave the spinal cord?

A

the ventral root

4
Q

What are the three funiculi of the spinal cord?

A

posterioir, lateral and anterior

5
Q

what 3 types of fibres run in these funiculi?

A

ascencding fibres - sensory
descending fibres -motor
commissural - transvers

6
Q

what is a motor unit?

A

a motor unit and all the fibres is innervates

7
Q

what is tetanus?

A

when the firing rate of APs is constant and hence a continuous contraction occurs

8
Q

what is the size principle?

A

small motor neurons will be activated first as they reach threshold first

9
Q

how is sensory feedback given?

A

sensory neurons enter the dorsal horn and make synaptic connects with spinal interneurons and alpha motor neurons