Motor control: spinal reflexes Flashcards Preview

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Flashcards in Motor control: spinal reflexes Deck (14):
1

why are reflexes important

need to relay info for purposeful movement

2

how are reflexes classified

by type of nerve that transports it

3

where is motor spindle located

in parralled with striated muscle

4

what happens when spindle stretched

causes afferent AP>synapse on dorsal horn>alpha motor neuron AP

5

what 3 things occur when catch a dropped brick

1. engage biceps
2. engage other related flexors
3. inhib. triceps

6

what is alpha-gamma coactivation

alpha- muscle fiber contraction
gamma - intrafusal fiber contracts spindle to maintain length

7

what is spindle afferent nerve type

1a

8

where is golgi tendon organ located

in tendon the muscle attaches to

9

what type of nerve is golgi tendon afferent

1b

10

what happens when 1b reflexes

synapses on interneuron>mixed other signals>inhibitory to muscle

11

what is withdrawal reflex

if step on something with right foot, will flex R and extend L to maintain balance

12

what is reversal of flexion reflex

because of descending motor commands, can result in opposed reflex actions

13

what happens to reflexes over successive trials

can increase or decrease them depending on what the situation calls for

14

what mediates the stumble reflex

skin afferents in the feet

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