The reticular formation controls the activity of the gamma motor system and thus regulates muscle tone.
Gamma motor system (γ motor neuron): It is a type of neuron system that takes part in muscle contraction. Their cell bodies are present in the anterior part of spinal cords which receives the activating input from the reticular formation of the pons in the brainstem. They are not directly involved in lengthening or shortening muscles rather they function in pulling or stretching muscle spindles which then maintain the firing of alpha neurons resulting in muscle contraction.
These gamma neurons are more active and effection when their axons are surrounded by myelin [a lipid-rich material] as compared to non-myelinated axons.
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