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ON THE DIFFERENCE OF CARDIOVASCULAR EFFECTS BETWEEN CAUDAL VENTROLATERAL MEDULLA PRESSOR AREA (cVMP) AND ROSTROLATERAL MEDULLA PRESSOR AREA (rVMP)

DA1 XIU-ZHONG

(Deyamtrnenl of Physiology，Fujian Medical College, Fujian 350004)

Abstract

In 56 urethane anesthetized Wistar rats，bilateral microinjection of glutamate (L-
glu) was used to observe the difference of cardiovascular effects between caudal ventrolateral medulla pressor area (cVMP)and rostral ventrolateral medulla pressor area (rVMP).The results showed that the pressor effect of cVMP was weaker than that of rVMP and was not accampanied by responses in heart rate. In the latter case，an increase of heart rate was involved. The baroreflex was inhibited when rVMP was activated by L-glu but facilitated when cVMP was activated. The above results suggest that the pathway and functions of the cardiovascular effects of rVMP are differnt from those of cVMP.

Key words: cardiovascular effect;baroreflex;microinjection;glutamate;ventrolateral medulla

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Citing This Article：

DA1 XIU-ZHONG. ON THE DIFFERENCE OF CARDIOVASCULAR EFFECTS BETWEEN CAUDAL VENTROLATERAL MEDULLA PRESSOR AREA (cVMP) AND ROSTROLATERAL MEDULLA PRESSOR AREA (rVMP) . Acta Physiol Sin 1996; 48 (4): (in Chinese with English abstract).