<prompt> In epidural analgesia morphine acts by acting on -Substantia gelatinosaAxonsVentral hornSensory nerve  <response>: Ans. is a i.e., Substantia gelatinosa o Analgesic action of morphine has spinal and supraspinal components. It acts in the substantia gelatinosa of dorsal horn to inhibit release of excitatory transmitters from primary afferent carrying pain impulses. 