Neuro #28 reflexes and spindles.txt
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Which are easier to activate, small or large motor units? Why?
Small b/c their threshhold is lower
Which has a higher threshhold, spindles or golgi tendon organs?
Golgi tendon organs (which is why it is the last player in reflexes)
What is autogenic inhibition?
- Golgi tendon organ
- Signal from 1b fibers that synapse on interferons
- Inhibition of Alpha motor activation
What is the withdrawal reflex?
- When a painful sensory stimulus is acquired
- Sensory nerve signals interneurons to synapse on alpha motor neurons
- Both excitatory and inhibitory synapses occur
What is the crossed extension reflex?
- Same painful stimulus crosses SC and synapses on interneurons
- Interneurons synapse on excitatory and inhibitory alpha motor neurons
- Excitatory: extensors excited
- Inhibitory: flexors inhibited
**Goal is to maintain balance with one leg while the other is moving away from painful stimulus
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