頁籤選單縮合
題名 | Evoked Potential Elicited by Periaqueductal Grey Stimulation in the Pressor Sites of Dorsal and Ventrolateral Medulla in Cats= |
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作者 | 嚴震東; 顏克典; 童吉士; 蔡作雍; |
期刊 | 中國生理學雜誌 |
出版日期 | 19950900 |
卷期 | 38:3 1995.09[民84.09] |
頁次 | 頁171-176 |
分類號 | 381.48 |
語文 | eng |
關鍵詞 | Dorsal medulla; Evoked potential; Midbrain; Periaqueductal grey; Ventrolateral medulla; |
英文摘要 | 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. |
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