8.The muscle ansa of the puborectal muscle and that of the pubococcygal muscle assume an overlapping relationship at the lateral and posterior aspects of the anal flexure.

 
  • 耻骨直肠肌肌袢部和耻骨尾骨肌肌袢在肛直曲两侧和后方呈内、外重叠关系。
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