Motor System (Spinal Mechanism) (NB.035) Flashcards
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Impulses in α-motor neuron controlled by impulses coming from:
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1- Sensory neurons in dorsal root ganglia.
2- Interneurons inside the spinal cord gray matter.
3- Descending fibers from higher brain centers (e.g. brain stem).
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Why Stretch Reflex is the fastest reflex in the body?
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- Rapidly conducting afferent
- Monosynaptic with least central delay.
- Rapidly conducting efferent.
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Q: What is the mechanism of stimulation of intrafusal fibers ?
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By stretch of the central part by:
- Lengthening of the whole muscle.
- γ efferent discharge.
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