MUSCLE SPINDLE
\mˈʌsə͡l spˈɪndə͡l], \mˈʌsəl spˈɪndəl], \m_ˈʌ_s_əl s_p_ˈɪ_n_d_əl]\
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Mechanoreceptors found between skeletal muscle fibers. Muscle spindles are arranged in parallel with muscle fibers and respond to the passive stretch of the muscle, but cease to discharge if the muscle contracts isotonically, thus signaling muscle length. The muscle spindles are the receptors responsible for the stretch or myotactic reflex (REFLEX, STRETCH).
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