分析其可能的原因是传导痛觉的脊髓丘脑侧束在上行过程中有不交叉纤维。
The cause may be that there were uncrossing nerve fibers in the lateral spinothalamic tract.
脊髓丘脑束神经细胞在传导痛觉中同样起主要作用，但疼痛时抓挠却不会止痛，其原因目前仍不知。
Scientists have shown scratching helps relieve an itch as it blocks activity in some spinal cord nerve cells that transmit the sensation to the brain.
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