, Volume 20, Issue 6, pp 542–548 | Cite as

Effect of stimulating periaqueductal gray matter on low- and high-threshold response of pontine and bulbar reticular neurons

  • M. V. Karpukhina
  • A. P. Gokin
  • Yu P. Limanskii


Electrical stimulation of the periaqueductal gray matter (PGM) bringing about inhibition of high-threshold mouth-opening reflex on somatosensory response of neurons belonging to the pontine caudal reticular nucleus (CN) and the reticular gigantocellular nucleus (GN) were investigated in cats under light chloralose-induced anesthesia. It was found that inhibitory effects on CN and GN neurons adhered to the principle of control over their main synaptic input: in GN neurons and particularly in “high-threshold” cells, inhibition mainly affected response to nociceptive stimuli, in contrast to CN neurons, and “low-threshold” cells in particular, where response to non-nociceptive stimulation was inhibited. The possible mechanisms and functional significance of the effects described are discussed.


Gray Matter Electrical Stimulation Functional Significance Synaptic Input Reticular Nucleus 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Literature Cited

  1. 1.
    E. V. Gura and V. V. Garkavenko, “Effects of stimulating the periaqueductal gray matter on neuronal response of the medial thalamic nuclei,” Neirofiziologiya,19, No. 4, 660–665 (1987).Google Scholar
  2. 2.
    E. V. Gura, V. A. Yakhnitsa, and Yu. P. Limanskii, “Inhibition of mouth-opening reflex in the cat produced by stimulating the periaqueductal gray matter and the raphe nuclei,” Neirofiziologiya,16, No. 3, 374–384 (1984).Google Scholar
  3. 3.
    M. V. Karpukhina, A. P. Gokin, and Yu. P. Limanskii, “Activation of pontine reticulospinal and bulbar neurons in the cat by somatosensory stimulation of different modalities,” Neirofiziologiya,18, No. 4, 461–469 (1986).Google Scholar
  4. 4.
    V. M. Storozhuk, S. F. Ivanova, and A. N. Tal'nov, “Role of midbrain periaqueductal gray matter in performance of conditioned reflex,” Neirofiziologiya,16, No. 3, 403–418 (1984).Google Scholar
  5. 5.
    A. J. Basbaum and H. L. Fields, “Endogenous pain control systems: brainstem spinal path-ways and endorphin circuitry,” Annu. Rev. Neurosci.,7, No. 3, 309–338 (1984).Google Scholar
  6. 6.
    S. H. H. Chan and C. D. Barnes, “A presynaptic mechanism evoked from brain stem reticular formation in the lumbar cord and its temporal significance,” Brain Res.,45, No. 1, 101–114 (1972).Google Scholar
  7. 7.
    J. O. Dostrovsky, “Raphe and periaqueductal gray induced suppression of non-nociceptive neuronal responses in the dorsal column nuclei and trigeminal sub-nucleus caudalis,” Brain Res.,200, No. 1, 184–199 (1980).Google Scholar
  8. 8.
    R. W. Eicknoff and H. O. Handwerker, “Characteristics of periaqueductal gray neurons recorded in the behaving rat,” Neurosci. Lett.,19, No. 5, 375 (1980).Google Scholar
  9. 9.
    D. W. Gallager and A. Pert, “Afferents to brain stem nuclei (brain stem raphe, nucleus reticularis pontis caudalis and nucleus gigantocellularis) in the rat as demonstrated by microiontophoretically applied horseradish peroxidase,” Brain Res.,144, No. 2, 257–277 (1978).Google Scholar
  10. 10.
    D. P. Harris and J. G. Sinclair, “Electrophysiological evidence for a direct connection between the periaqueductal gray and the nucleus gigantocellularis in the rat,” Exp. Neurol.,72, No. 3, 544–551 (1981).Google Scholar
  11. 11.
    D. P. Harris and J. G. Sinclair, “Periaqueductal gray stimulation: effect on characterized nucleus gigantocellularis neurons in the rat,” Exp. Neurol.,72, No. 3, 552–558 (1981).Google Scholar
  12. 12.
    P. W. Mantyh, “Connections of midbrain periaqueductal gray in the monkey. 2. Descending efferent projections,” J. Neurophysiol.,49, No. 3, 582–594 (1983).Google Scholar
  13. 13.
    T. J. Morrow and K. L. Casey, “Analgesia produced by mesencephalic stimulation: effect on bulboreticular neurons,” in: Advances in Pain Research and Therapy, Vol. 1, J. J. Bonica and D. Albe-Fessard (eds.), Raven Press, New York (1976), pp. 503–510.Google Scholar
  14. 14.
    J. L. Oliveras, A. Woda, G. Guidbaud, et. al. “Inhibition of the jaw-opening reflex by electrical stimulation of the periaqueductal gray matter in the awake, unrestrained cat,” Brain Res.,72, No. 2, 328–331 (1974).Google Scholar
  15. 15.
    M. Peshanski and J. M. Besson, “A spino-reticulo-thalamic pathway in the rat: an anatomical study with reference to pain transmission,” Neurosci.,12, No. 1, 165–174 (1984).Google Scholar
  16. 16.
    P. Petrovisky, “The raphe-reticular connection. An experimental study using the silver impregnation and horseradish peroxidase techniques in the rat,” J. Hirnforsch.,22, No. 4, 429–439 (1981).Google Scholar
  17. 17.
    D. V. Reinolds, “Surgery in the rat during electrical analgesia induced by focal brain stimulation,” Science,164, No. 3878, 444–445 (1969).Google Scholar
  18. 18.
    J. H. Wolstencroft, “The role of raphe and medial reticular neurons in control systems related to nociceptive inputs,” in: The Reticular Formation Revisited, J. A. Hobson and M. A. Brazier (eds.), Raven Press, New York (1980), pp. 349–371.Google Scholar
  19. 19.
    T. L. Yaksh, D. L. Hammond, and G. M. Tyce, “Functional aspects of bulbospinal monoaminergic projections in modulating processing of somatosensory information,” Fèd. Proc.,40, No. 13, 2786–2794 (1981).Google Scholar
  20. 20.
    T. Yokota, “Differential inhibitory effects of volleys from dorsal raphe nucleus upon spinal and spino-bulbo-spinal reflexes,” Neurosci. Lett.,7, No. 3, 291–294 (1977).Google Scholar

Copyright information

© Plenum Publishing Corporation 1989

Authors and Affiliations

  • M. V. Karpukhina
  • A. P. Gokin
  • Yu P. Limanskii

There are no affiliations available

Personalised recommendations