Behavioral and trigeminal neuronal effects of rat brainstem-nanoinjected opiates

Lang Yan Xia, Kun Hou Huang, J. Peter Rosenfeld*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Single injections of Met-enkephalin (ME; 27 rats) and artificial cerebrospinal fluid (ACF; 9 rats) in nucleus reticularis paragigantocellularis (PGC) and periaqueductal gray (PAG), and simultaneous conjoint PAG + PGC injections were made, and effects on facial responsiveness and caudal-trigeminal nuclear neuronal activity studied. It was found that all ME injections depressed the evoked excitatory neuronal and behavioral responses to noxious stimulation. Conjoint injections had apparently additive effects in comparison to single injection effects. Neither conjoint nor single injections had systematic effects on spontaneous neuronal activity. The ACF had no effects on any neuronal or behavioral activity.

Original languageEnglish (US)
Pages (from-to)65-73
Number of pages9
JournalPhysiology and Behavior
Issue number1
StatePublished - Jul 1992


  • Enkephalins
  • Nucleus reticularis paragigantocellularis
  • Opiate analgesia
  • Pain
  • Periaqueductal gray
  • Trigeminal nucleus

ASJC Scopus subject areas

  • Experimental and Cognitive Psychology
  • Behavioral Neuroscience


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