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muscle spindle

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noun
Cell Biology. a proprioceptor in skeletal muscle, composed of striated muscle fibers and sensory nerve endings in a connective tissue sheath, that conveys information via the spinal nerves on the state of muscle stretch, important in the reflex mechanism that maintains body posture.
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Origin of muscle spindle

First recorded in 1890โ€“95
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, ยฉ Random House, Inc. 2023

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