Which neurological state is characterized by reduced gamma motor tone, less excitable spindles, and greater ROM around a joint?

• A. Neurological facilitation
• B. Neuromuscular dysfunction
• C. Neurological inhibition
• D. Mechanical restriction

Answer: (C)

Lower gamma motor tone reduces the sensitivity of muscle spindles to stretch. Muscle spindles rely on gamma motor neurons to maintain their tautness and responsiveness to length changes. When gamma tone drops, intrafusal fibers slacken, the Ia afferent signal decreases, and the stretch reflex input to the alpha motor neurons weakens. The result is less reflexive muscle contraction in response to stretch, leading to less resistance and a greater range of motion around the joint. This combination of diminished spindle excitability and reduced reflexive drive fits a neurological inhibition state. If gamma tone were increased, spindles would be more excitable and ROM would be more restricted due to stronger reflexive resistance; mechanical restriction would limit ROM for non-neural reasons, and neuromuscular dysfunction is a broader, less specific category.