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PTA Physical Therapy Assistant

Category - Data Collection

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Which part of the skeletal muscle is involved in the stretch reflex mechanism?

Extrafusal fibers
Intrafusal fibers
Capsule
All of the above

Explanation

Answer: B -Intrafusal fibers of the skeletal muscle is involved in the stretch reflex mechanism.

Intrafusal fibers are small, paralleled to extrafusal fibers, and encapsulated. From here, afferent impulses are taken to the stretch receptor at the spinal cord.

Extrafusal fibers are large ordinary fibers.

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