INTERVENTION : The origin of spinal roots of the sacral plexus and sciatic nerv e , the distribution of corresponding spinal root between the sciatic nerve and ot her nerves were followed up .
干预：在20具尸体标本上追踪骶丛和坐骨神经的脊神经根来源、相应的脊神经根在坐骨神经和其他神经之间的分布。
nerv