1. This is because vibrations stimulate muscle spindles in the calf muscles. 2. The afferent of the muscle spindle bifurcates in the spinal cord. 3. These neurons also play a role in adjusting the sensitivity of muscle spindles . 4. Muscle spindle derived GDNF neurotrophic factors must also be present for postnatal survival.5. The imbalance causes an inaccurate reading from muscle receptors in the muscle spindle . 6. Gamma motor neurons assist in keeping the muscle spindle taut, thus adjusting sensitivity. 7. When a muscle lengthens, the muscle spindle is stretched and its nerve activity increases. 8. This process maintains the tautness of muscle spindles and is called alpha gamma co-activation. 9. Without gamma motor neurons, muscle spindles would be very loose as the muscle contracts more. 10. The parallel pulling keeps muscle spindles taut and readily able to detect minute changes in stretch.
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