<prompt> Central muscle relaxants act byDecreasing muscle excitationDecreasing spinal polysynaptic reflexesInhibiting spinal polysynaptic reflexesDecreasing nerve conduction  <response>: Refer KDT 6e p 348 Centrally acting muscle relaxants reduce skeletal muscle tone by a selective action in the cerebrospinal axis, without altering consciousness They selectively depress spinal and supraspinal polysynaptic reflexes Polysynaptic pathways in the ascending reticular formation which are involved in the maintenance of wakefullness 