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1. The body wall has outer circular and inner longitudinal muscles.
   体壁有外环形肌和内纵行肌。
2. The parietal peritoneum, a simple epithelium, was a most inner layer of the body wall, in which there were some multiciliary cells.
   体壁的最内为壁体腔膜，由单层上皮细胞组成，朝体腔侧有具纤毛细胞的存在。