Muscle spindles play a key function in the sensory-motor feedback loop. They notify the central nervous system of changes in:

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Muscle spindles play a major role in the sensory-motor feedback loop by signaling changes in muscle length. The spindles are positioned in parallel with skeletal muscle fibers; this unique position allows them to play the role of mechanoreceptor, rapidly responding to changes in the muscle. They can serve a protective function, by activating the stretch reflex when a muscle is rapidly over-stretched, and a proprioceptive function, by telling the brain where the body is positioned in space.

Muscle Spindles Play a Key Function in the Sensory-Motor Feedback