Methods: Twenty lumbar segments were dissected and studied. The relationship between the retroperitoneum, psoas muscle, and the lumbar plexus was analyzed.
方法：解剖并研究20个腰椎节段，分析腹膜后隙、腰大肌和腰丛之间的关系。
Methods: Twenty lumbar segments were dissected and studied. The relationship between the retroperitoneum, psoas muscle, and the lumbar plexus was analyzed.
方法：解剖并研究20个腰椎节段，分析腹膜后隙、腰大肌和腰丛之间的关系。
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