内源性下行抑制系统在痛觉传递与调制中具有重要作用。
Endogenous descending inhibitory system plays an important role in the modulation of nociceptive transmission.
目的：分析K物质在大鼠中脑导水管周围灰质中参与痛觉调制的作用，揭示内源性镇痛系统的神经递质机制。
AIM: To analyze the effect of substance K on pain modulation in the periaqueductal gray (PAG) of rats and indicate the neurotransmitter mechanism in endogenous analgesia system.
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