In epidural analgesia morphine acts by acting on -
Substantia gelatinosa
Axons
Ventral horn
Sensory nerve
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.