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马尾是指一束神经纤维,它起自脊髓末端,穿过下脊椎(椎骨)以及骶椎(脊柱底部的骨骼)。马尾意思是拉丁语中马的尾巴,因为它外观上较为相近。
马尾可能会被破裂或突出的椎间盘、肿瘤或脓肿压迫。它也可能被损伤或者炎症导致的水肿(如强直性脊柱炎的情况)损害。因此而导致的症状称为马尾综合征。