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.

 
  • 恥骨直腸肌肌袢部和恥骨尾骨肌肌袢在肛直曲兩側和后方呈內、外重疊關(guān)系。
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