What fibers do gamma motor neurons innervate?

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Multiple Choice

What fibers do gamma motor neurons innervate?

Explanation:
Gamma motor neurons regulate how the muscle spindle detects stretch by targeting intrafusal fibers inside the spindle. When these neurons fire, the ends of the intrafusal fibers contract, keeping the central sensory region taut as the muscle length changes. This keeps the spindle sensitive to stretch and maintains accurate sensory feedback to the nervous system. Extrafusal fibers—the usual force-generating muscle fibers—are innervated by alpha motor neurons, not gamma. Tendon organs (Golgi tendon) involve different sensory pathways, and smooth muscle is controlled by autonomic nerves, not gamma motor neurons. So the fibers innervated by gamma motor neurons are the intrafusal fibers.

Gamma motor neurons regulate how the muscle spindle detects stretch by targeting intrafusal fibers inside the spindle. When these neurons fire, the ends of the intrafusal fibers contract, keeping the central sensory region taut as the muscle length changes. This keeps the spindle sensitive to stretch and maintains accurate sensory feedback to the nervous system. Extrafusal fibers—the usual force-generating muscle fibers—are innervated by alpha motor neurons, not gamma. Tendon organs (Golgi tendon) involve different sensory pathways, and smooth muscle is controlled by autonomic nerves, not gamma motor neurons. So the fibers innervated by gamma motor neurons are the intrafusal fibers.

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