脊髓背角是痛信息传递的关键门户。大量研究结果证明,几乎没有来自于外周的痛信息仅在脊髓中继就简单地向上位脑结构传递。目前能够肯定的是,脊髓背角存在较为复杂的神经环路,该环路的传入是不同类型的初级传入纤维,该环路内部包括不同层次不同类型的神经元,该环路的传出较为单一,是投射神经元,但是这些投射纤维不仅向传统神经解剖学概念上痛信息第三级神经元丘脑投射,更多的投射纤维涉及其它多个脑区。同时,目前得到共识的是,脊髓背 Spinal dorsal horn is the key portal for the transmission of pain information. Numerous studies have shown that virtually no pain information from the periphery is simply transmitted to the superior mesencephalon only in the spinal cord relay. At present, it can be affirmed that there is a complicated neuro-loop in the dorsal horn of the spinal cord. The afferent loop of the spinal cord is a different type of primary afferent fiber. The loop includes different types of neurons at different levels. However, these projection fibers not only project to the thalamic neurons of the third neurons in the traditional concept of neuroanatomy, but more of the projection fibers involve multiple brain regions. At the same time, the consensus is that spinal cord back