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Muscle spindle fibers are classified as intrafusal fibers. These fibers are enclosed in a spindle-shaped connective tissue sac and are composed of 5-14 muscle fibers. There are three types of intrafusal fibers: dynamic nuclear bag fibers (bag 1 fibers), static nuclear bag fibers (bag 2 fibers), and nuclear chain fibers .
Dynamic nuclear bag fibers are so named because their nuclei are located in the central region of the fiber and are surrounded by a fluid-filled space. Static nuclear bag fibers have nuclei located at one end of the fiber. Nuclear chain fibers have nuclei arranged in a chain-like fashion along the length of the fiber.
Muscle spindles are found within the belly of a skeletal muscle. Muscle spindles are fusiform (spindle-shaped), and the specialized fibers that make up the muscle spindle are called intrafusal muscle fibers. The regular muscle fibers outside of the spindle are called extrafusal muscle fibers .
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