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18 Cards in this Set
- Front
- Back
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Medial brainstem pathways/ tracts |
reticulospinal, vestibulospinal, tectospinal |
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Lateral Brainstem pathways/ tracts |
rubrospinal |
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A clinincal note for reflexes |
can be used to diagnose the level of a CNS lesion and it's cause |
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Automatic postural adjustments |
more complex than reflexes involve the brain stem, spinal cord and reflexes |
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Are reflexes fixed? |
No. They adapt for certain tasks |
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Why do we need spinal reflexes? (4) |
1. Maintain posture 2. To avoid danger 3. To smooth out fine motor movements 4. prevent overly forceful movements |
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Is Hyperreflexia a positive or negative sign? |
Positive |
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where are the cell bodies of sensory neurons that relay info to the spinal cord? |
DRG, TG |
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Muscle Spindles: What are they made of and what's their significance |
made of intrafusal fibers sense muscle length, which is important for knowing where the muscle is (proprioception) |
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1a afferents |
Muscle spindle afferent sense change in length and codes the speed of stretch |
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2 afferents |
muscle spindle afferent sense static length and codes the duration of stretch |
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What does it mean to unload intrafusal fibers, and what effect does it have? |
to contract muscle this causes afferents to stop firing |
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What are golgi tendons and what do they do? |
a muscle receptor senses muscle tension |
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How to Gamma motor neurons keep muscle spindles sensitive at all lengths? |
contract intrafusal fibers when they become slack so that they keep firing |
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Why is alpha-gamma motor neuron activation important |
prevents sensory afferent neuron from falling silent during muscle contraction |
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significance of monosynpatic reflex |
maintain the right amount of tension in muscle for proper motor control |
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function of inhibitory interneuron |
coordinates reciprocal innervation |
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spinal cord sites for descending modulation of a reflex |
alpha motor neuron, interneuron, presynaptic terminal of sensory afferent neuron |
