This muscle runs obliquely downwards inside the abdominal cavity.这块肌肉在腹腔内斜向下延伸。Peritonitis is an inflammation of the peritoneum, the serous membrane which lines part of the abdominal cavity.腹膜炎是腹膜,也就是部分包裹腹腔的血清膜发生的炎症。Through this incision, the abdominal cavity is distended with carbon dioxide gas.二氧化碳气体通过这个切口进入,造成腹腔肿胀。