- 期刊
Evoked Potential Elicited by Periaqueductal Grey Stimulation in the Pressor Sites of Dorsal and Ventrolateral Medulla in Cats
並列摘要
Evoked potential methods were used to compare the patterns of responses to periaqueductal grey (PAG) stimulation in two major medullary sympathoexcitatory areas, namely, ventrolateral medulla (VLM) and dorsal medulla (DM). Adult cats were anethestized with chloralose and urethane, paralyzed, ventilated and bilaterally vagotomized. Pressor points in the PAG were identified with rectangular pulses in 80Hz, 200μA, 0.1ms and used as stimulation points. Pressor points in VLM and DM were identified by injection of 100nl of 0.25M glutamate solution. Adjacent points 1mm away from these pressor points where injected the same amount of glutamate solution elicited very little blood pressure changes were used as control recording points. Stimulation of the PAG pressor points with rectangular pulse in 1Hz, 0.1ms, 200μA elicited complex evoked field potentials in both VLM and DM. In 9 of the 13 pressor-control pairs tested, distinctive evoked potential of long latency were seen in the pressor point only. These evoked potentials, averaged 3.5ms in the DM, and 5.6ms in the VLM. Therefore, it was postulated that pressor points of PAG had separate and independent connections with DM and VLM.
延伸閱讀
- Chen, S. Y., & Chai, C. Y. (1999). Non-NMDA Receptors Mediate both Pressor and Depressor Actions of the Cardiovascular-Reactive Areas in the Brainstem of Cats. The Chinese Journal of Physiology, 42(2), 95-101. https://www.airitilibrary.com/Article/Detail?DocID=03044920-199906-42-2-95-101-a
- Hsieh, J. H., Chu, T. C., Yen, C. T., & Chai, C. Y. (2000). Effects of Chemical Lesioning the Dorsal or Rostral Ventrolateral Medulla on Glutamate-induced Cardiovascular Actions of the Pontine Gigantocellular Tegmental Field and Lateral Tegmental Field of the. Acta Zoologica Taiwanica, 11(1), 17-32. https://doi.org/10.6576/AZT.2000.11.(1).2
- Kow, L. M., & Huang, T. F. (1968). The Respiratory and Cardiovascular Responses to Electrical and Chemical Stimulation of Medullary Areas in Cats. The Chinese Journal of Physiology, 20(2), 117-124. https://www.airitilibrary.com/Article/Detail?DocID=03044920-196812-20-2-117-124-a
- Billings, C. J., Papesh, M. A., Penman, T. M., Baltzell, L. S., & Gallun, F. J. (2012). Clinical Use of Aided Cortical Auditory Evoked Potentials as a Measure of Physiological Detection or Physiological Discrimination. International Journal of Otolaryngology, 2012(), 154-167. https://doi.org/10.1155/2012/365752
- Yang, C. Y. (2012). Comparison Response to Tactile and Noxious Stimulation of the Ventral Posterolateral Nuclei under Anesthetized and Conscious State of Rats [master's thesis, National Taiwan University]. Airiti Library. https://doi.org/10.6342/NTU.2012.02704