Muscles have which efferent nerve fibers for regulating tone?
Ans. is 'b' i.e., Gamma neuron(Ref: Ganong 23'd/e p.158-162; Guyton 12n/e p. 657)Muscle tone is maintained by stretch reflex through muscle spindles (intrafusal fibers).
a-neuron
Gamma neuron
Beta neuron
Delta neuron