What fibers do alpha motor neurons innervate?

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Multiple Choice

What fibers do alpha motor neurons innervate?

Explanation:
Alpha motor neurons are the somatic motor neurons that directly cause muscle shortening. They innervate extrafusal skeletal muscle fibers, the fibers responsible for producing the force of movement. Inside the muscle spindle, intrafusal fibers set the sensitivity of the spindle and are innervated by gamma motor neurons, not alpha. Tendon cells are not the contractile fibers controlled by these neurons, and cardiac muscle fibers are regulated by the autonomic nervous system rather than alpha motor neurons.

Alpha motor neurons are the somatic motor neurons that directly cause muscle shortening. They innervate extrafusal skeletal muscle fibers, the fibers responsible for producing the force of movement. Inside the muscle spindle, intrafusal fibers set the sensitivity of the spindle and are innervated by gamma motor neurons, not alpha. Tendon cells are not the contractile fibers controlled by these neurons, and cardiac muscle fibers are regulated by the autonomic nervous system rather than alpha motor neurons.

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