2 motor-post

2 motor-post - motor systems spinal cord mixed nerve...

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motor systems
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spinal cord
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mixed nerve
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Peripheral Nerves-- compound action potential 0 1 2 3 4 40 ms
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Fiber Classifications Dorsal Roots (sensory) (A- α ) spindles 12-20 μm 70-120m/s golgi tendon 10-18 60-100 (A- β ) tactile 6-12 35-70 (A- δ ) sharp pain/temp 1-6 10-40 C dull pain <1 (un) 0.5-2 Ventral Roots (motor) (A- α ) α -motor 12-20 70-120 (A- γ ) γ -motor 3-6 15-40
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the stretch reflex: muscle spindles
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Muscle Spindles: the sensory apparatus
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spinal cord
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Muscle spindle firing rates rest stretch contraction (unloading) rest -- stretch provides tension on the intrafusal muscles to cause sensory axons to fire -- You need a way to supply tension to the muscle spindle no matter what the muscle length
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Muscle Spindles: the motor apparatus
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γ -motor system --innervates intrafusal fibers --regulates tension on the intrafusal fibers in parallel with the contraction of the extrafusal fibers ( α - γ coactivation ) --ensures that the spindles work over a wide range of muscle lengths (wide dynamic range )
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The Reflex Arc is monosynaptic α -motor neuron +
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antagonistic muscles
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This note was uploaded on 04/18/2010 for the course BISC 421 at USC.

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2 motor-post - motor systems spinal cord mixed nerve...

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