Besides those three tracts, very rarely, a hemisection of the spinal cord above the T1 spinal level can also damage the sympathetic chain that runs alongside the spinal cord and supplies the facial region.

在很罕见的情况下，除了上述三条神经束，脊髓在胸1水平以上的半切损伤还会损伤沿脊髓走行、支配对应面部区域的交感神经。