membrana atlantooccipitalis posterior

例句：

1. 1. The patient's condition worsened after the surgery.
   手术后，病人的状况恶化了。
2. 2. The researcher found that the membranous structure was essential for the function of the organ.
   研究者发现这种膜状结构对于器官的功能至关重要。
3. 3. The membranous layer is responsible for protecting the skin from external factors.
   这层膜负责保护皮肤免受外界因素的侵害。