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Function of alpha and gamma MNs. MNs can be divided into two groups: larger α-MNs and smaller γ-MNs. α-MNs innervate skeletal muscles, and their activity generates muscle tension and joint movements; γ-MNs innervate intrafusal fibers of muscle spindles, and their activity increases the group Ia and II afferent discharges (i.e., increases the sensitivity of muscle spindles [38]).
