Which of the following statements is INCORRECT about "intrafusal muscle fibres" in any given muscle?Group of answer choicesthey make up a small proportion of the total mass of contractile muscle fibresthey are located within muscle spindlesthey are activated by alpha motor neuronsduring voluntary muscle activity they often contract in parallel with extrafusal muscle fibresthey extend the range of stretch-sensitivity of muscle spindles PreviousNext
Question
Which of the following statements is INCORRECT about "intrafusal muscle fibres" in any given muscle?Group of answer choicesthey make up a small proportion of the total mass of contractile muscle fibresthey are located within muscle spindlesthey are activated by alpha motor neuronsduring voluntary muscle activity they often contract in parallel with extrafusal muscle fibresthey extend the range of stretch-sensitivity of muscle spindles PreviousNext
Solution
The incorrect statement about intrafusal muscle fibers is: "they are activated by alpha motor neurons".
Intrafusal muscle fibers are actually activated by gamma motor neurons, not alpha motor neurons. Alpha motor neurons innervate extrafusal muscle fibers, which are responsible for the force exerted by contraction of the muscle. Gamma motor neurons, on the other hand, maintain the sensitivity of the intrafusal muscle fibers (which are part of the muscle spindle) during muscle contraction.
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