Fusimotor System
The fusimotor system is a system by which the central nervous system controls muscle spindle sensitivity. It consists of muscle spindles along with fusimotor neurons - beta motor neurons and gamma motor neurons. Because beta motor neurons innervate extrafusal as well as intrafusal muscle fibers, they are more specifically named skeletofusimotor neurons. Gamma motor neurons are the efferent (sending signals away from the central nervous system) part of the fusimotor system, whereas muscle spindles are the afferent part as they send signals relaying information from muscles toward the spinal cord and brain.
Read more about this topic: Gamma Motoneuron
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