1 microgram morphine sulfate or 30 microgram [ d-ala2 ] -met-enkephalin microcannulated into the bulbar nuclei reticularis gigantocellularis and paragigantocellularis produced profound analgesia for orofacial thermal nociception , while having a smaller analgesic effect on tail-flick latency , and no effect on aversive stimulation thresholds in midbrain and in the spinal trigeminal nucleus ( subnucleus caudalis ) .
C0014295
met-enkephalin
C0234194
nociception