Which of the following is TRUE? Group of answer choicesGamma motor neurons provide afferent feedback to the spinal cord.Extrafusal fibres are innervated by alpha motor neurons.Alpha motor neurons provide afferent feedback to the CNS.Extrafusal fibres are innervated by gamma motor neurons.
Question
Which of the following is TRUE? Group of answer choicesGamma motor neurons provide afferent feedback to the spinal cord.Extrafusal fibres are innervated by alpha motor neurons.Alpha motor neurons provide afferent feedback to the CNS.Extrafusal fibres are innervated by gamma motor neurons.
Solution
The statement "Extrafusal fibres are innervated by alpha motor neurons" is TRUE.
Here's why:
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Extrafusal fibers are the main force-generating component of a muscle. They are innervated by alpha motor neurons.
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Alpha motor neurons are large, multipolar lower motor neurons of the brainstem and spinal cord. They innervate extrafusal muscle fibers of skeletal muscle and are directly responsible for initiating their contraction.
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Gamma motor neurons, on the other hand, innervate intrafusal muscle fibers, not extrafusal fibers. They play a crucial role in the sensory function of muscle and are not involved in the actual force generation.
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Neither alpha nor gamma motor neurons provide afferent feedback to the CNS or spinal cord. They are efferent neurons, meaning they carry signals away from the CNS to effectors in the body. Afferent feedback to the CNS and spinal cord is provided by sensory neurons, not motor neurons.
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