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Muscle Spindles

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Definition: Skeletal muscle structures that function as the mechanoreceptors responsible for the stretch or myotactic reflex (REFLEX, STRETCH). They are composed of a bundle of encapsulated SKELETAL MUSCLE FIBERS, i.e., the intrafusal fibers (nuclear bag1 fibers, nuclear bag2 fibers, and nuclear chain fibers) innervated by sensory neurons.     
See Also Reflex, Stretch 		Other names Stretch Receptors, Muscle; Receptors, Stretch, Muscle; Neuromuscular Spindles; Muscle Stretch Receptors; Stretch Receptor, Muscle; Spindles, Neuromuscular; Spindles, Muscle; Spindle, Neuromuscular; Spindle, Muscle; Receptors, Muscle Stretch; Receptor, Muscle Stretch; Neuromuscular Spindle; Muscle Stretch Receptor; Muscle Spindle

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Sources: NLM Medical Subject Headings, NIH UMLS, Drugs@FDA, FDA AERS original data copyright United States Government. No endorsement implied. Last modified 6/6/2012
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