在20具(男16,女4)成人尸体上,对胸12、腰l椎骨对应的蛛网膜下隙内脊髓节、脊神经前、后根进行了应用解剖学研究.结果胸12椎骨多与腰2～5脊髓节、胸12～腰5脊神经根对应;腰1椎骨与骶1～尾脊髓节、腰1～尾脊神经根对应,据此,损伤时利于定位诊断.腰l～3脊神经根远侧段与腰4～骶3的近侧段之间常有一定长度的重叠,重叠的长度供神经缝接参考.文内还对神经根排列位置,前、后根的数目、长度和外径等进行了观察. In 20 adult (male 16, female 4) adult cadavers, anatomical study was performed on the spinal segments in the subarachnoid space corresponding to the thoracic and lumbar vertebrae, anterior and posterior roots of the spinal cord. 2 ~ 5 spinal section, chest 12 ~ lumbar 5 spinal nerve root corresponding; lumbar 1 vertebra and sacral 1 ~ caudal spinal cord section, lumbar 1 ~ caudal spinal nerve root corresponding, thus, damage is conducive to the diagnosis of positioning lumbar l ~ 3 spinal nerve root far There is usually a certain length of overlap between the lateral segment and the proximal segment of the lumbosacral vertebra 4 ~ sacral 3. The length of the nerve root and the outer diameter Etc. were observed.