Gamma motor neurons are specialized nerve cells that play a crucial role in regulating muscle tone and the sensitivity of muscle spindles. They are part of the motor neuron system and primarily innervate the intrafusal fibers of muscle spindles, which are sensory receptors located within muscles. By adjusting the tension in these fibers, gamma motor neurons help maintain the proper functioning of the muscle spindle during movement. These neurons work alongside alpha motor neurons, which directly stimulate extrafusal muscle fibers to produce muscle contractions. While alpha motor neurons control voluntary movements, gamma motor neurons ensure that the muscle spindles remain responsive to changes in muscle length, contributing to proprioception and coordination.