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9 Cards in this Set
- Front
- Back
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Ia sensory fibers
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primary ending of spindle, large and myelinated, rapidly adapting, provides velocity sensitivity or movement sense
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IIa sensory fibers
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myelinated, but smaller, conduct slower, slow adapting, provide static sensitivity or position sense
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How do Ia sensory fibers respond to intrafusal stretching
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respond to dynamic component of stretching
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How do IIa sensory fibers respond to intrafusal stretching
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respond continuously although at different rates
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Intrafusal fibers receive efferent input from...
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gamma motor neurons
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Golgi tendon organ
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is in series with muscle, senses information about the tension
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Muscle spindle
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in parallel with the muscle, detects length/position
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What is the simplest spinal reflex
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monosynaptic stretch reflex
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Describe stretch reflex
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group Ia fibers are activated by muscle stretch, they directly stimulate alpha motor neurons that innervate extrafusal fibers of the same muscle, accomplished by Ia inhibitory interneuron
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