Muscle06/effect of intrafusal muscles
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The intrafusal muscles locate on both ends of the muscle spindle. So, when the intrafusal muscles contract, the muscle spindle is stretched and sensitivity to further stretching is increased.
The extrafusal muscles are innervated by alpha motor neurons, and the intrafusal muscles innervated by the gamma motor neurons.
Challenge Quiz
1.
The intrafusal muscles are innervated by the gamma, alpha motor neurons.
2.
The extrafusal muscles are innervated by the gamma,alpha motor neurons.
3.
With contraction of the intrafusal muscles, the sensitivity of the muscle spindles increase. does not change very much. decrease .