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muscle spindle
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Diagram of a mammalian muscle spindle showing its structure within muscle tissue, including extrafusal and intrafusal muscle fibers, motor and sensory nerve endings, sheath, and lymph, with labeled components illustrating sensory reception in human and mammal anatomy.
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muscle spindle: Media

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mammalian muscle spindle
A mammalian muscle spindle, showing both extrafusal and intrafusal fibers.
Encyclopædia Britannica, Inc.