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