Methods: To observe the relationship between piriformis and the adjacent structures, and study the position sciatic nerve piercing out and its main branches on 52 fixed adult cadavers.

• 方法：对52具防腐固定的成人尸体，解剖观测梨状肌与相对缘结构之间的关系，坐骨神经穿出部位、分支等。