Spinal Cord Motor Circuits Flashcards Preview

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Flashcards in Spinal Cord Motor Circuits Deck (15)
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1
Q

Somatosensory receptor process

A

Stimulus interacts with receptor…moves down axon into trigger zone and causes AP if high enoguh threshold

2
Q

Frequency of AP generated depends on

A

Intensity and duration
If higher intensity - more
If longer - more

3
Q

In somatosensory, first order neuron is always

A

Excitatory

4
Q

If stimulus applied to center of receptive field

A

Greater response initiated than it in peripheral region

5
Q

Higher order somatosensory neurons

A

Can be excititory or inhibitory

Have central excitatory field with a surrounding inhibitory region

6
Q

Lateral inhibition

A

If touch in the center, excitatory repsonse in the middle while inhibitory from the peripheral

Helps define 2 point touch

7
Q

3 types of central motor system movements

A

Voluntary
Rhythmic
Reflex

8
Q

Muscle spindles and golgi tendons

A

Spindle - positive feedback that induces contraction when stretched

Golgi - reduces force of contraction to compensate the load

9
Q

Extra vs intrafusal innervation

A

Extra - alpha, fast

Intra - gamma, sloweer

10
Q

Static and dynamic muscle spindle sensory

A

Static - 1a, fast acting and sense change

Dynamic - 2…duration and tension

11
Q

Passive stretching

A

Increases firing of 1a afferent which activates alpha motor neurons to increase tnesion

12
Q

Golgi tendon

A

Sensitive to contraction

1b afarents ysnapse on inhibitory interneurons that innervate alpha neurons and inhibited alpha neuron contraction

13
Q

CPG

A

Rhythmic activity capable in absence of phasic sensory input from peripheral receptors

Bilateral half inhibt opposing muscle groups within ipsilateral and 180 out of phase with contralateral half center

14
Q

Walking - lesion spinal cord or mesencephalic locomotion region

A

Spianl - can walk but not weight bear

MLR - stimulation responsible for initiating walking

15
Q

Important descending pathways in CPG

A

R/F, RN, VN