The body wall has outer circular and inner longitudinal muscles. 體壁有外環(huán)形肌和內縱行肌。
The parietal peritoneum, a simple epithelium, was a most inner layer of the body wall, in which there were some multiciliary cells. 體壁的最內為壁體腔膜，由單層上皮細胞組成，朝體腔側有具纖毛細胞的存在。
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