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Neural Control of Movement06

Neural Control of Movement06 - Stretch reflex Muscle...

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Unformatted text preview: Stretch reflex Muscle spindles are distributed throughout the muscle. Their density varies With the degree of control required by a given muscle. B. Golgi Tendon Organs Location - encapsulated in tendon fibers near the junction of the muscle and tendon fibers. They are approximately one millimeter long and 0.1 millimeters in diameter. They are in series With the muscle fibers rather than in parallel as are muscle spindles. When a muscle contracts, the GTO is stretched. Functions - the firing rate of the GTO is very sensitive to changes in the tension of the muscle. 1. Sensory input from GTO about the tension produced by muscles is useful for a variety of motor acts, such as maintaining a steady grip on an object. 2. When stimulated by excessive tension or stretch --> send sensory information to the CNS --> causes the contracted muscle to relax (reflex inhibition) - protect the muscle and its connective tissue harness from damage due to excessive loads C. Joint Receptors Supply information to the CNS concerning joint angle, acceleration of the joint, etc. ...
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